Grover's locking version of their classic Rotomatic housing, keeping the familiar 3+3 look while adding a rear thumbwheel that locks the string in place.
31 guitars checked: 2 likely drop-in, 29 needs verification.
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.
See the full notes below
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Tuner hole size
10mm
ConfirmedGear ratio
18:1
ConfirmedMounting pattern
Single rear mounting screw with a threaded hex peghead bushing.
Installs easily with a screwdriver. Rear thumbwheel locks the string in place: feed, lock, and tune in seconds.
31 guitars checked: 2 likely drop-in, 29 needs verification.
Epiphone
Grover's locking Rotomatics, which Grover list as a direct swap for the 18:1 Rotomatics this guitar ships with.
Epiphone list Grover Rotomatic tuners with an 18:1 ratio on the Les Paul Custom. Grover sell the 502 locking set as a drop-in replacement for their 18:1 Rotomatics, for 25/64 inch holes.
Gibson
The same Grover locking Rotomatics this guitar ships with, with kidney buttons instead of keystone.
Gibson list Grover Locking Rotomatic tuners with keystone buttons on the Les Paul Modern. The 502C is Grover's locking Rotomatic with kidney buttons, for 25/64 inch holes.
Epiphone
Locking Rotomatics for 10mm holes. A straight swap on finishes that ship with Grovers, like the Double Gold. On other finishes, measure a tuner hole first, as it may be smaller.
Grover's Roto-Grip locking housing uses the same 10mm bore as their non-locking Rotomatics. 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 502 a 25/64 inch (10mm) post hole and list it as a swap for their 18:1 and locking Rotomatics, but not the standard 14:1 Rotomatic. Take one tuner off, measure the hole and check where the screw or pins sit before ordering.
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 502 a 25/64 inch (10mm) post hole and list it as a swap for their 18:1 and locking Rotomatics, but not the standard 14:1 Rotomatic. Take one tuner off, measure the hole and check where the screw or pins sit before ordering.
Epiphone
Locking Rotomatics for 10mm holes. Some owners report 10mm on this guitar, but Epiphone don't publish it and it may be smaller. Measure one 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.
Epiphone
Hole size should be right either way, but this model has shipped from the factory with more than one brand of tuner. Check which ones you actually have before ordering.
Some units of this model have shipped with Wilkinson tuners rather than the Grover Rotomatics Epiphone list in the spec. Both sit in a 10mm hole, so the headstock does not need reaming either way, but the bushing that comes out is not always the same part, which affects how cleanly the replacement seats.
Epiphone
Not confirmed. Epiphone don't publish this guitar's tuner hole size or screw position, so measure yours before buying.
Epiphone list Grover Rotomatic tuners on this guitar but don't publish the hole size or screw position. Grover give the 502 a 25/64 inch (10mm) post hole and list it as a swap for their 18:1 and locking Rotomatics, but not the standard 14:1 Rotomatic. Take one tuner off, measure the hole and check where the screw or pins sit before ordering.
ESP
The tuner hole size matches, but this guitar's screw mounting pattern is angled differently from a standard mount.
Hipshot's own fitment guidance for the ESP LTD Eclipse states tuner mounting screw holes are angled 45 degrees, a nonstandard pattern.
ESP
The tuner hole size matches, but this guitar's screw mounting pattern is angled differently from a standard mount.
Hipshot's own fitment guidance for the ESP LTD Eclipse states tuner mounting screw holes are angled 45 degrees, a nonstandard pattern.
ESP
The tuner hole size matches, but this guitar's screw mounting pattern is angled differently from a standard mount.
Shares the same Eclipse-body headstock, 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.
Hipshot's own fitment guidance for the ESP LTD Eclipse states tuner mounting screw holes are angled 45 degrees, a nonstandard pattern.
ESP
The tuner hole size matches, but this guitar's screw mounting pattern is angled differently from a standard mount.
Hipshot's own fitment guidance for the ESP LTD Eclipse states tuner mounting screw holes are angled 45 degrees, a nonstandard pattern.
ESP
The tuner hole size matches, but this guitar's screw mounting pattern is angled differently from a standard mount.
Shares the same Eclipse-body headstock, 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.
Shares the same Eclipse-body headstock, 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.
Shares the same Eclipse-body headstock, 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.
LTD EC series shares the same Eclipse-body headstock design, nonstandard angled screw mount.
ESP
ESP list Grover tuners on this guitar but don't say which model, so the hole size isn't confirmed. Measure your tuner holes before buying.
Listings reproducing ESP's spec for the LTD Viper-400 give the tuners only as Grover, with no model named, and ESP don't publish the tuner hole size. Grover give this set a 25/64 inch (10mm) post hole. Take one tuner off and measure the hole in your headstock before ordering.
Gibson
Locking Rotomatics for 10mm holes. Gibson fit Vintage Deluxe tuners to this guitar and don't publish the hole size, which may be smaller. Measure one before buying.
Grover's Roto-Grip locking housing uses the same 10mm bore as their non-locking Rotomatics. 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 list Grover Rotomatic tuners with kidney buttons on this guitar but don't publish the hole size or screw position. Grover give the 502 a 25/64 inch (10mm) post hole and list it as a swap for their 18:1 and locking Rotomatics, but not the standard 14:1 Rotomatic. Take one tuner off, measure the hole and check where the screw or pins sit before ordering.
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 502 a 25/64 inch (10mm) post hole and list it as a swap for their 18:1 and locking Rotomatics, but not the standard 14:1 Rotomatic. Take one tuner off, measure the hole and check where the screw or pins sit before ordering.
Gibson
Not confirmed. Gibson don't publish this guitar's tuner hole size or screw position, so measure yours before buying.
Gibson list Grover Rotomatic tuners with kidney buttons on this guitar but don't publish the hole size or screw position. Grover give the 502 a 25/64 inch (10mm) post hole and list it as a swap for their 18:1 and locking Rotomatics, but not the standard 14:1 Rotomatic. Take one tuner off, measure the hole and check where the screw or pins sit before ordering.
Gibson
Not confirmed. Gibson don't publish this guitar's tuner hole size or screw position, so measure yours before buying.
Gibson list Grover Rotomatic tuners with kidney buttons on this guitar but don't publish the hole size or screw position. Grover give the 502 a 25/64 inch (10mm) post hole and list it as a swap for their 18:1 and locking Rotomatics, but not the standard 14:1 Rotomatic. Take one tuner off, measure the hole and check where the screw or pins sit before ordering.
Gibson
Not confirmed. Gibson don't publish this guitar's tuner hole size or screw position, so measure yours before buying.
Gibson list Grover Rotomatic tuners with kidney buttons on this guitar but don't publish the hole size or screw position. Grover give the 502 a 25/64 inch (10mm) post hole and list it as a swap for their 18:1 and locking Rotomatics, but not the standard 14:1 Rotomatic. Take one tuner off, measure the hole and check where the screw or pins sit before ordering.
Gibson
Not confirmed. Gibson don't publish this guitar's tuner hole size or screw position, so measure yours before buying.
Gibson list Grover Rotomatic tuners with kidney buttons on this guitar but don't publish the hole size or screw position. Grover give the 502 a 25/64 inch (10mm) post hole and list it as a swap for their 18:1 and locking Rotomatics, but not the standard 14:1 Rotomatic. Take one tuner off, measure the hole and check where the screw or pins sit before ordering.
Gibson
Locking Rotomatics for 10mm holes. Gibson fit Vintage Deluxe tuners to this guitar and don't publish the hole size, which may be smaller. Measure one before buying.
Grover's Roto-Grip locking housing uses the same 10mm bore as their non-locking Rotomatics. 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 list Grover Rotomatic tuners with kidney buttons on this guitar but don't publish the hole size or screw position. Grover give the 502 a 25/64 inch (10mm) post hole and list it as a swap for their 18:1 and locking Rotomatics, but not the standard 14:1 Rotomatic. Take one tuner off, measure the hole and check where the screw or pins sit before ordering.
Gretsch
Post hole size on this guitar has varied by production year in owner reports, from around 8.5mm up to a full 10mm. Measure your existing tuners before ordering.
Owner-measured tuner post holes vary by production year on this guitar family. A 2016 owner measured 8.5mm, while other Electromatic-era owners have measured 9.75mm to a full 10mm on similar models, the last requiring shimming for a clean fit. Confirm your own guitar's post size before ordering this 10mm-post tuner.
Gretsch
Gretsch fit Gotoh locking tuners to this guitar, which normally sit in 10mm holes like these Grovers. Gretsch don't publish the hole size though, so take one tuner off and measure before buying.
Gretsch list Gotoh locking tuners on the current G6120T but don't give the model or hole size. Gotoh's locking tuners for this headstock style use a 10mm hole, which would suit Grover's 10mm Roto-Grip housing, but no G6120T has been measured. The 8.5mm to 10mm owner measurements sometimes quoted come from Electromatic models, not this guitar.
Schecter
Right 3+3 layout and the 10mm holes match, but this guitar ships with Schecter's own locking tuners, whose mounting screw position isn't published. Take one tuner off and check where its screw sits before ordering, or be ready to drill a small new pilot hole.
This guitar ships with Schecter-branded locking tuners in 10mm holes on a 3+3 headstock, per Schecter's own spec. Grover's 502 locking set matches the layout and hole size and uses a single rear mounting screw with a threaded bushing, but the screw position of Schecter's stock tuners isn't published, so screw alignment is unconfirmed.
Yamaha
A locking upgrade in the right three-per-side layout, made for 10mm holes, the usual size on this guitar. Yamaha don't publish the tuner hole size or screw positions, so measure first.
Grover specify a 25/64 inch (10mm) peghole for the Roto-Grip locking 502 series. Yamaha list die-cast tuners on the RSS20 but not the model, hole size or screw position, so the fit is unconfirmed.
If you have fitted any of these to this Grover 502 Roto-Grip Locking Rotomatics Tuners 3 x 3, tell us what you found and we'll update the data.
