Should swap straight into the existing tuner holes, no reaming needed.
Why we say this
Standard curved Fender-style 6-in-line headstock at a 10mm hole.
Tuner
Sperzel Trim-Lok Locking Tuners (6-in-line, Staggered)
A widely used locking tuner line offering both vintage and modern bore versions, a common alternative to Fender, Gotoh and Schaller locking lines.
34 guitars checked: 12 likely drop-in, 16 needs verification, 6 requires modification.
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Where to buy
Amazon
Price not publishedIn stock
Being re-verified
Part specs
Tuner hole size
10mm
ConfirmedMounting pattern
Single-pin mount, no separate mounting screw needed. Staggered/graduated post heights, for 6-in-line headstocks that do not tilt back (Strat, Tele style). Confirmed via Sperzel and authorized-distributor product listings.
ConfirmedGear ratio
12:1
ConfirmedGuitars we've checked
34 guitars checked: 12 likely drop-in, 16 needs verification, 6 requires modification.
Should swap straight into the existing tuner holes, no reaming needed.
Why we say this
Standard curved Fender-style 6-in-line headstock at a 10mm hole.
Matches the tuner holes already on this guitar. A well established alternative to Fender and Gotoh locking lines.
Why we say this
Sperzel's standard locking line uses the modern 10mm bore matching this guitar's tuner holes.
Should swap straight into the existing tuner holes, no reaming needed.
Why we say this
Standard curved Fender-style 6-in-line headstock at a 10mm hole.
Should swap straight into the existing tuner holes, no reaming needed.
Why we say this
Standard curved Fender-style 6-in-line headstock at a 10mm hole.
Should swap straight into the existing tuner holes, no reaming needed.
Why we say this
Standard curved Fender-style 6-in-line headstock at a 10mm hole.
Matches the tuner holes already on this guitar. A well established alternative to Fender and Gotoh locking lines.
Why we say this
Sperzel's standard locking line uses the modern 10mm bore matching this guitar's tuner holes.
Matches the tuner holes already on this guitar. A well established alternative to Fender and Gotoh locking lines.
Why we say this
Sperzel's standard locking line uses the modern 10mm bore matching this guitar's tuner holes.
Should swap straight into the existing tuner holes, no reaming needed.
Why we say this
Ibanez AZ series uses a curved Fender-like 6-in-line headstock, not the pointed reverse style.
Should swap straight into the existing tuner holes, no reaming needed.
Why we say this
Ibanez AZ series uses a curved Fender-like 6-in-line headstock, not the pointed reverse style.
Should swap straight into the existing tuner holes, no reaming needed.
Why we say this
Ibanez AZ series uses a curved Fender-like 6-in-line headstock, not the pointed reverse style.
Should swap straight into the existing tuner holes, no reaming needed.
Why we say this
Standard curved Fender-style 6-in-line headstock at a 10mm hole.
Hole size should match, but this guitar has a pointed reverse headstock where aftermarket tuner screw holes sometimes do not line up.
Why we say this
MH series uses ESP's inline reversed headstock, owner reports describe aftermarket screw holes not lining up.
Help confirm this fit
Should fit closely, but this guitar's exact hole size has not been independently confirmed. Worth measuring first.
Why we say this
Sperzel's standard line uses a 10mm bore, but this guitar's exact hole diameter is only cited at roughly 10.26mm in a single forum source, not manufacturer-confirmed.
Help confirm this fit
Should fit closely, but the same caveat applies as our other locking tuner option: this guitar's exact hole size has not been independently confirmed.
Why we say this
Same reported 10.26mm hole size question that applies to the guitar's other plain-bore locking tuner option, Sperzel's standard line uses a plain 10mm bore, close but not an exact confirmed match.
Help confirm this fit
This guitar already has factory locking tuners of a different design. Confirm your peghole size before ordering.
Why we say this
This guitar ships with a different factory locking tuner design (short-post) than Sperzel's standard 10mm line assumes. Bore compatibility has not been independently confirmed.
Help confirm this fit
This guitar already has factory locking tuners of a different design. Confirm your peghole size before ordering.
Why we say this
This guitar ships with a different factory locking tuner design (short-post) than Sperzel's standard 10mm line assumes. Bore compatibility has not been independently confirmed.
Help confirm this fit
Hole size should match, but this guitar has a pointed reverse headstock where aftermarket tuner screw holes sometimes do not line up.
Why we say this
Ibanez pointed reverse headstock, screw hole alignment not guaranteed.
Help confirm this fit
Hole size should match, but this guitar has a pointed reverse headstock where aftermarket tuner screw holes sometimes do not line up.
Why we say this
Ibanez pointed reverse headstock, screw hole alignment not guaranteed.
Help confirm this fit
Hole size should match, but this guitar has a pointed reverse headstock where aftermarket tuner screw holes sometimes do not line up.
Why we say this
Ibanez pointed reverse headstock, screw hole alignment not guaranteed.
Help confirm this fit
Hole size should match, but this guitar has a pointed reverse headstock where aftermarket tuner screw holes sometimes do not line up.
Why we say this
Ibanez pointed reverse headstock, screw hole alignment not guaranteed.
Help confirm this fit
Hole size should match, but this guitar has a pointed reverse headstock where aftermarket tuner screw holes sometimes do not line up.
Why we say this
Ibanez pointed reverse headstock, screw hole alignment not guaranteed.
Help confirm this fit
Hole size should match, but this guitar has a pointed reverse headstock where aftermarket tuner screw holes sometimes do not line up.
Why we say this
Ibanez pointed reverse headstock, screw hole alignment not guaranteed.
Help confirm this fit
Hole size should match, but Jackson's reverse headstock is known for aftermarket tuner screw holes not lining up.
Why we say this
Jackson pointed reverse headstock, screw hole alignment not guaranteed.
Help confirm this fit
Hole size should match, but Jackson's reverse headstock is known for aftermarket tuner screw holes not lining up.
Why we say this
Jackson pointed reverse headstock, screw hole alignment not guaranteed.
Help confirm this fit
Hole size should match, but Jackson's reverse headstock is known for aftermarket tuner screw holes not lining up.
Why we say this
Jackson pointed reverse headstock, screw hole alignment not guaranteed.
Help confirm this fit
Hole size should match, but Jackson's reverse headstock is known for aftermarket tuner screw holes not lining up.
Why we say this
Jackson pointed reverse headstock, screw hole alignment not guaranteed.
Help confirm this fit
Hole size should match, but Jackson's reverse headstock is known for aftermarket tuner screw holes not lining up.
Why we say this
Jackson pointed reverse headstock, screw hole alignment not guaranteed.
Help confirm this fit
Drilling
Like our other locking tuner option, these need the holes reamed larger, this guitar's vintage-spec headstock does not take modern tuners as a straight swap.
Why we say this
These are 10mm-post tuners going into a guitar built with smaller vintage-style holes, the same reaming requirement that applies to modern locking tuners generally on this guitar's vintage-spec headstock.
Help confirm this fit
Drilling
This is the modern-bore version of this tuner. Your guitar has vintage-style holes, so this specific version would need reaming.
Why we say this
This catalog entry is Sperzel's modern 10mm line. This guitar has a genuinely vintage-spec headstock, so these would need the holes reamed out.
Help confirm this fit
Drilling
This is the modern-bore version of this tuner. This guitar's tuners are styled to look vintage but lock internally, and that style typically sits on a smaller vintage-sized post, so this version would likely need reaming, though we have not independently measured this exact guitar's holes.
Why we say this
This catalog entry is Sperzel's modern 10mm line. This guitar's stock tuners are styled to look vintage but lock internally, a Fender pattern that typically keeps a small vintage-sized post rather than a modern one, so this modern-bore version would likely need the holes reamed, though the exact stock hole size has not been independently measured on this model.
Help confirm this fit
Drilling
This is the modern-bore version of this tuner. Your guitar has vintage-style holes, so this specific version would need reaming.
Why we say this
This catalog entry is Sperzel's modern 10mm line. This guitar has a genuinely vintage-spec headstock, so these would need the holes reamed out.
Help confirm this fit
Drilling
This is the modern-bore version of this tuner. Your guitar has vintage-style holes, so this specific version would need reaming.
Why we say this
This catalog entry is Sperzel's modern 10mm line. This guitar has a genuinely vintage-spec headstock, so these would need the holes reamed out.
Help confirm this fit
Drilling
This is the modern-bore version of this tuner. Your guitar has vintage-style holes, so this specific version would need reaming.
Why we say this
This catalog entry is Sperzel's modern 10mm line. This guitar has a genuinely vintage-spec headstock, so these would need the holes reamed out.
Help confirm this fit
This page has 22 open questions
If you have fitted any of these to this Trim-Lok Locking Tuners (6-in-line, Staggered), tell us what you found and we'll update the data.