Grover's classic sealed-gear Rotomatic tuner on a modern 10mm post, a common upgrade for guitars that already have modern-spec tuner holes.
37 guitars checked: 17 likely drop-in, 18 needs verification, 2 requires modification.
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Andertons
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Tuner hole size
10mm
ConfirmedGear ratio
14:1
ConfirmedMounting pattern
Single rear mounting screw with a threaded hex peghead bushing.
37 guitars checked: 17 likely drop-in, 18 needs verification, 2 requires modification.
Grover's Rotomatics are built for 10mm holes, which is what this guitar has. Straight swap, no reaming.
The Epiphone ES-335 has a Gibson-style 3-per-side headstock drilled at 10mm. Grover's Rotomatic housing is built for a 10mm bore, so the posts seat in the existing holes.
A direct swap for the stock tuners, no reaming needed. This style of 3-per-side set works the same for left and right-handed guitars.
This guitar's tuner holes are confirmed at 10mm, matching the standard modern Grover Rotomatic bore directly. This is a 3-per-side headstock, and standard 3-per-side tuner sets are not manufactured as separate left and right-handed SKUs the way 6-in-line sets are, the same set splits three-and-three regardless of which way the guitar faces.
Matches this guitar's confirmed 10mm tuner holes directly, an easy swap within the same tuner family it already ships with.
This guitar already ships with Grover Rotomatic tuners at a confirmed 10mm hole size, so a same-family Grover swap is about as safe a fit claim as there is.
Direct swap for the stock Vintage Deluxe tuners, no reaming needed.
Grover Rotomatics are the standard 10mm-hole reference point, consistent with the current Epiphone LP's 10mm bushings.
Matches this guitar's confirmed 10mm tuner holes. Some units of this guitar shipped with a different tuner brand than usual, so it is worth checking what you actually have installed before buying, even though the hole size itself is confirmed.
This guitar's tuner hole size is confirmed at 10mm, matching this tuner directly. Some production units of this model have shipped with Wilkinson tuners instead of the usual Grover Rotomatics, so confirm what you actually have installed before assuming this is a same-brand swap, though the hole size itself is confirmed regardless of which brand shipped.
Matches this guitar's confirmed 10mm tuner holes directly, an easy swap within the same tuner family it already ships with.
This guitar's tuner hole size is confirmed at 10mm, matching this tuner directly.
Grover's Rotomatics are built for 10mm holes, which is what this guitar has. It already ships with Grover tuners, so this is a direct like-for-like swap.
The Viper 400 has a 3-per-side headstock drilled at 10mm and leaves the factory with Grover tuners already fitted, so this is a like-for-like replacement of the stock part.
Matches this guitar's confirmed 10mm tuner holes.
This guitar's tuner hole size is confirmed at 10mm, matching this tuner directly.
Matches this guitar's confirmed 10mm tuner holes, the same tuner family it already ships with.
This guitar's tuner hole size is confirmed at 10mm, matching Gibson's own spec sheet listing Grover Rotomatics as stock.
A direct swap for the stock tuners, no reaming needed.
This guitar's tuner holes are confirmed at 10mm, matching the standard modern Grover Rotomatic bore directly.
Matches this guitar's confirmed 10mm tuner holes, the same tuner family it already ships with.
This guitar's tuner hole size is confirmed at 10mm, matching this tuner directly. This guitar's stock tuners are already a locking Grover Rotomatic, so this is a same-family swap.
Matches this guitar's confirmed 10mm tuner holes. This headstock has three tuners a side either way, so there is no left or right-handed version to worry about here.
This guitar's tuner hole size is confirmed at 10mm, matching this tuner directly. A 3-per-side Gibson-style headstock is symmetric, so individual sealed tuners like this one have no handedness of their own, unlike a 6-in-line headstock where mirrored parts matter.
Fits the existing 10mm tuner holes on this guitar without any drilling.
The 60s reissue specifically (as distinct from the Standard 50s) is consistently reported across multiple sources as shipping with modern Grover-style tuners on 10mm holes with screw-in bushings, confirmed by several My Les Paul Forum threads discussing this reissue by name. Not a genuine source conflict, the earlier hedge here was inaccurate.
A direct swap for the stock tuners, no reaming needed.
This guitar's tuner holes are confirmed at 10mm, matching the standard modern Grover Rotomatic bore directly. Tuner hole size is unrelated to the bridge spacing dispute.
Matches the tuner holes already on this guitar. A straightforward tuner upgrade, no reaming needed.
This guitar's tuner holes are the modern 10mm Rotomatic-standard size used across current Gibson SG models, matching Grover's 102 line directly.
A direct swap for the stock tuners, no reaming needed. Unlike 6-in-line tuners, this style of 3-per-side set works the same for left and right-handed guitars.
This guitar's tuner holes are confirmed at 10mm, matching the standard modern Grover Rotomatic bore directly. Unlike 6-in-line Fender-style tuner sets, standard 3-per-side Gibson-style tuner sets are not manufactured as separate left and right-handed SKUs, the same six-piece set splits three-and-three regardless of which way the guitar faces.
Owners consistently report this as a clean drop-in replacement for the stock tuners, no reaming or drilling needed.
Multiple Streamliner owners report the Grover 102-18N dropping in perfectly on the G2622, at the guitar's standard 10mm post holes.
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. Earlier Casinos have vintage-size holes (about 8.3 to 8.4mm, measured on a 2021 Casino Coupe), so reaming to 10mm is needed there. 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.
Help confirm this fit
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.
Help confirm this fit
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.
Help confirm this fit
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.
Help confirm this fit
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.
Help confirm this fit
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.
Help confirm this fit
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.
Help confirm this fit
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.
Help confirm this fit
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.
Help confirm this fit
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.
Help confirm this fit
The 10mm tuner holes match, but this model has shipped with different stock tuners over the years, and their mounting screws sit in different places. Check where your current tuner screws are before ordering, or be ready to drill small new pilot holes.
This guitar's tuner hole size is confirmed at 10mm, matching this tuner directly. Stock tuners have varied by production year (Vintage Deluxe, Grover, or Kluson), and those styles do not share a single screw position, so whether the mounting screw lines up with the existing hole depends on which tuners a given guitar shipped with.
Help confirm this fit
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.
Help confirm this fit
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.
Help confirm this fit
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.
Help confirm this fit
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.
Help confirm this fit
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.
Help confirm this fit
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.
Help confirm this fit
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.
Help confirm this fit
Needs the tuner holes reamed out to 10mm before these will fit.
Grover Rotomatics use 10mm posts; Casino ships with vintage-spec holes (measured ~8.3-8.4mm on a related 2021 Casino Coupe, standard Casino not independently measured), reaming almost certainly required.
Help confirm this fit
These need larger tuner holes than this guitar has stock. Expect the holes to be reamed out for a proper fit, not a straight drop-in.
Grover's Rotomatic line is built around the modern 10mm bushing standard. This guitar's factory tuner holes are vintage-spec at roughly 8.8mm, so fitting these means reaming the holes out and refitting new bushings.
Help confirm this fit
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.
