Grover's classic sealed-gear Rotomatic tuner on a modern 10mm post, a common upgrade for guitars that already have modern-spec tuner holes.
38 guitars checked: 10 likely drop-in, 27 needs verification, 1 requires modification.
For your ESP E-II Eclipse
Needs verificationThe tuner hole size matches, but this guitar's screw mounting pattern is angled differently from a standard mount. The screw holes may not line up even if the post itself fits.
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Tuner hole size
10mm
ConfirmedGear ratio
14:1
ConfirmedMounting pattern
Single rear mounting screw with a threaded hex peghead bushing.
38 guitars checked: 10 likely drop-in, 27 needs verification, 1 requires modification.
Epiphone
A Grover Rotomatic set, which Grover list as a direct swap for the 18:1 Grover Rotomatics this guitar ships with.
Epiphone list Grover Rotomatic tuners with an 18:1 ratio on the Les Paul Custom. Grover sell the 102 as a drop-in replacement for their 18:1 Rotomatics, for 25/64 inch holes. This set has keystone buttons and a 14:1 ratio.
Epiphone
The same Grover Rotomatics this guitar ships with, with keystone buttons instead of kidney.
Epiphone list Grover Rotomatic tuners with kidney buttons on the Les Paul Standard 60s. The 102NK is Grover's Rotomatic with keystone buttons, for 25/64 inch holes, and Grover list it as a drop-in for their other Rotomatic series.
Epiphone
The same Grover Rotomatic tuners this guitar ships with, in a keystone-button version.
Epiphone list Grover Rotomatic tuners on the SG Standard. The 102NK is Grover's Rotomatic with keystone buttons, for 25/64 inch holes, and Grover list it as a drop-in for their other Rotomatic series.
Gibson
The same Grover Rotomatics this guitar ships with, with keystone buttons instead of kidney.
Gibson list Grover Rotomatics with kidney buttons on the ES-339. The 102NK is Grover's Rotomatic with keystone buttons, for 25/64 inch holes, and Grover list it as a drop-in for their other Rotomatic series.
Gibson
The same Grover Rotomatics this guitar ships with, with keystone buttons instead of kidney.
Gibson list Grover Rotomatics with kidney buttons on the Les Paul Classic. The 102NK is Grover's Rotomatic with keystone buttons, for 25/64 inch holes, and Grover list it as a drop-in for their other Rotomatic series.
Gibson
A non-locking Grover Rotomatic set that Grover list as a direct swap for the locking Rotomatics this guitar ships with.
Gibson list Grover Locking Rotomatic tuners with keystone buttons on the Les Paul Modern. Grover sell the 102 as a drop-in replacement for their 502 locking Rotomatics, for 25/64 inch holes. This set doesn't lock.
Gibson
The same Grover Rotomatics this guitar ships with, with keystone buttons. Three-a-side sets work on left-handed guitars as they are.
Gibson list Grover Rotomatic tuners with kidney buttons on the left-handed Les Paul Standard 60s. The 102NK is Grover's Rotomatic with keystone buttons, for 25/64 inch holes. Three-a-side sets aren't left- or right-handed, so the standard set fits.
Gibson
The same Grover Rotomatics this guitar ships with, with keystone buttons instead of kidney.
Gibson list Grover Rotomatic tuners with kidney buttons on the Les Paul Standard 60s. The 102NK is Grover's Rotomatic with keystone buttons, for 25/64 inch holes, and Grover list it as a drop-in for their other Rotomatic series.
Gibson
The same Grover Rotomatics this guitar ships with, with keystone buttons instead of kidney.
Gibson list Grover Rotomatic tuners with kidney buttons on the SG Standard. The 102NK is Grover's Rotomatic with keystone buttons, for 25/64 inch holes, and Grover list it as a drop-in for their other Rotomatic series.
Gibson
The same Grover Rotomatics this guitar ships with, with keystone buttons. Three-a-side sets work on left-handed guitars as they are.
Gibson list Grover Rotomatic tuners with kidney buttons on the left-handed SG Standard. The 102NK is Grover's Rotomatic with keystone buttons, for 25/64 inch holes. Three-a-side sets aren't left- or right-handed, so the standard set fits.
Epiphone
Needs 10mm holes. Older Casinos have smaller vintage-size holes that need reaming, but we have not confirmed the hole size on 2023 and later models. Measure yours first.
Grover Rotomatics use 10mm posts. One owner measured the tuner holes at about 8.3 to 8.4mm on a 2021 Casino Coupe, which would need reaming to 10mm. No hole size has been confirmed for the 2023 and later Casino, so whether reaming is needed is unknown. If the holes are already 10mm this would be a straight swap.
Epiphone
Built for 10mm holes. Finishes that ship with Grovers, like the Double Gold, already have them, so it's a straight swap there. On other finishes Epiphone don't publish the hole size, so measure one first.
Grover's Rotomatic housing is built for a 10mm bore. Epiphone list the standard ES-335 with Epiphone Deluxe tuners and don't publish the hole size. Special finishes such as the Double Gold ship with Grover Rotomatics, so those already have 10mm holes. On other finishes, take one tuner off and measure: 10mm means it drops in, anything smaller means the holes need reaming.
Epiphone
Not confirmed. Epiphone don't publish this guitar's tuner hole size or screw position, so measure yours before buying.
Epiphone don't publish the tuner hole size or mounting for this guitar. Grover give the 102 Rotomatic a 25/64 inch (10mm) post hole and list it as a swap for their other Rotomatic series, but we can't confirm this guitar has Grover Rotomatics. Take one tuner off, measure the hole and check where the screw or pins sit before ordering.
Epiphone
Built for 10mm holes. Some owners report 10mm on this guitar, but Epiphone don't publish it and it may be smaller. Take one tuner off and measure before buying.
Built for a 10mm tuner hole. Epiphone list this model with Epiphone Vintage Deluxe tuners and don't publish the hole size. Some owners report 10mm holes, but vintage-style tuners can sit in smaller holes. Take one tuner off and measure: 10mm means it drops in, anything smaller means the holes need reaming.
ESP
The tuner hole size matches, but this guitar's screw mounting pattern is angled differently from a standard mount. The screw holes may not line up even if the post itself fits.
Hipshot's own fitment guidance for the ESP LTD Eclipse states tuner mounting screw holes are angled 45 degrees from the tuner body, a nonstandard pattern that may not align with a standard two-screw mount even though the peghole diameter matches.
ESP
The tuner hole size matches, but this guitar's screw mounting pattern is angled differently from a standard mount. The screw holes may not line up even if the post itself fits.
Hipshot's own fitment guidance for the ESP LTD Eclipse states tuner mounting screw holes are angled 45 degrees from the tuner body, a nonstandard pattern that may not align with a standard two-screw mount even though the peghole diameter matches.
ESP
The tuner hole size matches, but this guitar's screw mounting pattern is angled differently from a standard mount. The screw holes may not line up even if the post itself fits.
Shares the same Eclipse-body headstock as the standard E-II Eclipse, where Hipshot's own fitment guidance confirms a nonstandard 45-degree angled screw mount.
ESP
The tuner hole size matches, but this guitar's screw mounting pattern is angled differently from a standard mount. The screw holes may not line up even if the post itself fits.
Hipshot's own fitment guidance for the ESP LTD Eclipse states tuner mounting screw holes are angled 45 degrees from the tuner body, a nonstandard pattern that may not align with a standard two-screw mount even though the peghole diameter matches.
ESP
The tuner hole size matches, but this guitar's screw mounting pattern is angled differently from a standard mount. The screw holes may not line up even if the post itself fits.
Hipshot's own fitment guidance for the ESP LTD Eclipse states tuner mounting screw holes are angled 45 degrees from the tuner body, a nonstandard pattern that may not align with a standard two-screw mount even though the peghole diameter matches.
ESP
The tuner hole size matches, but this guitar's screw mounting pattern is angled differently from a standard mount. The screw holes may not line up even if the post itself fits.
Shares the same Eclipse-body headstock as the standard E-II Eclipse, where Hipshot's own fitment guidance confirms a nonstandard 45-degree angled screw mount.
ESP
The tuner hole size matches, but this guitar's screw mounting pattern is angled differently from a standard mount. The screw holes may not line up even if the post itself fits.
Shares the same Eclipse-body headstock as the standard E-II Eclipse, where Hipshot's own fitment guidance confirms a nonstandard 45-degree angled screw mount.
ESP
The tuner hole size matches, but this guitar's screw mounting pattern is angled differently from a standard mount. The screw holes may not line up even if the post itself fits.
Shares the same Eclipse-body headstock as the standard E-II Eclipse, where Hipshot's own fitment guidance confirms a nonstandard 45-degree angled screw mount.
ESP
The tuner hole size matches, but this guitar's screw mounting pattern is angled differently from a standard mount. The screw holes may not line up even if the post itself fits.
The LTD EC series shares the same Eclipse-body headstock design as the E-II Eclipse, where Hipshot's own fitment guidance confirms a nonstandard 45-degree angled screw mount.
ESP
ESP don't publish the exact stock tuner or hole size for this guitar, so we can't confirm a like-for-like swap. Check your tuners' markings or measure a hole first.
Grover's 102 Rotomatics need a 10mm hole. ESP's spec for the LTD Viper 400 doesn't give the exact stock tuner model or the hole size, so this isn't confirmed as a direct swap. Take one tuner off, check its markings and measure the hole before buying.
Gibson
Built for 10mm holes. Gibson fit Vintage Deluxe tuners to this guitar and don't publish the hole size, which may be smaller. The screw position may also differ, so check both before buying.
Grover's Rotomatic housing is built for a 10mm bore. Gibson list this guitar with Vintage Deluxe tuners with keystone buttons and don't publish the hole size. Gibson's Deluxe-style tuners come in push-in bushing versions, which sit in smaller vintage holes, and screw-in bushing versions, which need larger holes, so the hole size on this guitar isn't known. Take one tuner off and measure: 10mm means a straight swap, anything smaller means reaming.
Gibson
Not confirmed. Gibson don't publish this guitar's tuner hole size or screw position, so measure yours before buying.
Gibson don't publish the tuner hole size or mounting for this guitar. Grover give the 102 Rotomatic a 25/64 inch (10mm) post hole and list it as a swap for their other Rotomatic series, but we can't confirm this guitar has Grover Rotomatics. Take one tuner off, measure the hole and check where the screw or pins sit before ordering.
Gibson
Built for 10mm holes. Gibson fit Vintage Deluxe tuners to this guitar and don't publish the hole size. If yours are smaller vintage holes they'll need reaming, so measure one before buying.
Grover's Rotomatic housing is built for a 10mm bore. Gibson list this guitar with Vintage Deluxe tuners with keystone buttons and don't publish the hole size. Gibson's Deluxe-style tuners come in push-in bushing versions, which sit in smaller vintage holes, and screw-in bushing versions, which need larger holes. Take one tuner off and measure: 10mm means a straight swap, anything smaller means reaming.
Gibson
Likely matches the standard 10mm bore most current Gibsons use, but this guitar's exact hole size hasn't been independently confirmed. Measure before buying.
This guitar's exact tuner hole size has not been independently confirmed. Matches the well-corroborated 10mm standard seen across most current Gibson USA models, but not specifically measured on this one.
Gibson
Likely matches the standard 10mm bore most current Gibsons use, but this guitar's exact hole size hasn't been independently confirmed. Measure before buying.
This guitar's exact tuner hole size has not been independently confirmed. Matches the well-corroborated 10mm standard seen across most current Gibson USA models, but not specifically measured on this one.
Gibson
Likely matches the standard 10mm bore most current Gibsons use, but this guitar's exact hole size hasn't been independently confirmed. Measure before buying.
This guitar's exact tuner hole size has not been independently confirmed. Matches the well-corroborated 10mm standard seen across most current Gibson USA models, but not specifically measured on this one.
Gibson
Built for 10mm holes. Gibson fit Vintage Deluxe tuners to this guitar and don't publish the hole size, which may be smaller. Take one tuner off and measure before buying.
Grover's Rotomatic housing is built for a 10mm bore. Gibson list this guitar with Vintage Deluxe tuners with keystone buttons and don't publish the hole size. Gibson's Deluxe-style tuners come in push-in bushing versions, which sit in smaller vintage holes, and screw-in bushing versions, which need larger holes, so the hole size on this guitar isn't known. Take one tuner off and measure: 10mm means a straight swap, anything smaller means reaming.
Gibson
Likely matches the standard 10mm bore most current Gibsons use, but this guitar's exact hole size hasn't been independently confirmed. Measure before buying.
This guitar's exact tuner hole size has not been independently confirmed. Matches the well-corroborated 10mm standard seen across most current Gibson USA models, but not specifically measured on this one.
Gretsch
Not confirmed. Gretsch don't publish this guitar's tuner hole size or screw position, so measure yours before buying.
Gretsch don't publish the tuner hole size or mounting for this guitar. Grover give the 102 Rotomatic a 25/64 inch (10mm) post hole and list it as a swap for their other Rotomatic series, but we can't confirm this guitar has Grover Rotomatics. Take one tuner off, measure the hole and check where the screw or pins sit before ordering.
Gretsch
Hole size should be close, but Gretsch tuner mounting patterns vary by model and this one has not been confirmed. Worth checking screw hole spacing before ordering.
Gretsch tuner mounting conventions vary meaningfully by model, this has not been confirmed for the G6120T specifically, and forum reports are mixed across the Gretsch range.
Hagstrom
Hagstrom does not publish the Ultra Swede's tuner hole size, so we cannot confirm this drops straight in. Measure your existing tuner posts before buying.
The Ultra Swede ships with Hagstrom's own non-locking 18:1 die cast tuners, and Hagstrom does not publish the tuner post hole size for this model, so fitment against Grover's standard 10mm hole cannot be confirmed either way.
Hagstrom
A popular tuner upgrade, but Hagstrom does not publish the Viking's tuner hole size, so we cannot confirm this drops straight in. Measure your existing tuner posts before buying.
Grover's Rotomatic is the standard 10mm hole reference point across most modern guitars, but Hagstrom's current die cast tuner hole size on the Viking is not published anywhere, and older Hagstrom models are documented using odd, non-standard hole sizes, so 10mm compatibility cannot be assumed the way it can on a modern Gibson or Epiphone.
Yamaha
Right three-per-side layout and made for 10mm holes, the usual size on this guitar. Yamaha don't publish the tuner hole size or screw positions, so measure a hole and check where your mounting screws sit before buying.
Grover specify a 25/64 inch (10mm) peghole for the 102 Rotomatic. Yamaha list die-cast tuners on the RSS20 but not the model, hole size or screw position, so the hole is Likely 10mm and screw alignment is unconfirmed.
Epiphone
Needs 10mm holes. One owner measured a Casino Coupe at about 8.3 to 8.4mm, and if yours matches, the holes need reaming out before these fit. Measure one first.
Grover Rotomatics use 10mm posts. One owner measured the tuner holes at about 8.3 to 8.4mm on a 2021 Casino Coupe, a close relative of this guitar. The standard Casino hasn't been measured, but if yours matches, the holes need reaming to 10mm. Measure one before buying.
If you have fitted any of these to this Grover 102 Rotomatic Tuners, 3+3, tell us what you found and we'll update the data.
