Grover's classic sealed-gear Rotomatic tuner, 18:1 ratio, a long-standing standard replacement for vintage-style tuners on 10mm-hole guitars.
25 guitars checked: 16 likely drop-in, 9 needs verification.
For your Hagstrom Viking
Needs verificationA 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.
See the full notes belowWhere to buy
Amazon
Being re-verified
Tuner hole size
10mm
ConfirmedGear ratio
18:1
ConfirmedMounting pattern
Single rear mounting screw with a threaded hex peghead bushing.
Grover Rotomatics are the standard 10mm-hole reference point for tuners generally, a common drop-in on any guitar already using modern 10mm tuner bushings.
25 guitars checked: 16 likely drop-in, 9 needs verification.
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.
Should swap straight into the existing tuner holes, no reaming needed. This tuner set is not handed, so the same part works on this left-handed guitar.
Standard 3+3 Gibson-style footprint, 10mm holes. Gibson and PRS-style 3-per-side tuner sets are not handedness-specific, so this fits the left-handed guitar without needing a separate SKU.
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.
Grover's Rotomatics are built for 10mm holes, which is what this guitar has. Straight swap, no reaming.
The ES-339 uses the same headstock hardware as the ES-335, drilled at 10mm. Grover's Rotomatic housing is built for a 10mm bore, so the posts seat in the existing holes.
Should swap straight into the existing tuner holes, no reaming needed.
Gibson's own spec sheet for this model confirms Grover tuners on the standard 3+3 footprint.
Grover's Rotomatics are built for 10mm holes, which is what this guitar has. Straight swap, no reaming.
Standard Gibson 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.
Should swap straight into the existing tuner holes, no reaming needed.
Ships with locking Grover Rotomatic tuners on the standard Gibson 3+3 footprint, no caveats noted.
Should swap straight into the existing tuner holes, no reaming needed. This tuner set is not handed, so the same part works on this left-handed guitar.
Same hardware footprint as the right-handed Les Paul Standard 60s. Gibson/PRS 3-per-side tuner sets are not handedness-specific, so no separate left-handed SKU is needed.
Grover's Rotomatics are built for 10mm holes, which is what this guitar has. Straight swap, no reaming.
Standard Gibson 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.
Grover's Rotomatics are built for 10mm holes, which is what this guitar has. Straight swap, no reaming.
Standard Gibson 3-per-side headstock drilled at 10mm, and Grover's Rotomatic housing is built for a 10mm bore. The unresolved question on this model is its bridge post spacing, which has no bearing on tuner fit.
Grover's Rotomatics are built for 10mm holes, which is what this guitar has. Straight swap, no reaming.
Standard Gibson 3-per-side headstock drilled at 10mm, and Grover's Rotomatic housing is built for a 10mm bore. The unresolved question on this model is which tailpiece is fitted, which has no bearing on tuner fit.
Should swap straight into the existing tuner holes, no reaming needed. This tuner set is not handed, so the same part works on this left-handed guitar.
Standard Gibson 3+3 footprint, 10mm holes. Gibson/PRS 3-per-side tuner sets are not handedness-specific.
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
Hole size should be close, but tuners on this model have varied by year. Confirm your actual tuner post diameter before ordering.
Tuners on the Gibson ES-335 have varied by production year between Vintage Deluxe, Grover, and Kluson units on roughly 10mm posts, rather than one settled spec. Grover's Rotomatic housing needs a 10mm bore, so the general size is close, but bushing fit can differ depending on which year's tuners are actually fitted.
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
If you have fitted any of these to this 406 Rotomatic 18:1, tell us what you found and we'll update the data.
