Have you tried tightening the screws on the end of the tuner buttons? I normally tighten them until it takes a reasonable bit of effort to turn them. It does help keep the tuner key in place and can reduce some backlash as it helps pull the worm gear against the rotary gear.
Originally Posted by Simon Barden
Yep, tried that, I found that it didn't help to reduce the backlash, all it did was make the guitar harder to tune up to pitch, I think when they made my set of Sperzel tuners the manufacturing tolerances was a bit off so that the gears didn't mesh tightly enough with the worm-gear, I might try buying a new set later on this year and see if I get better performing ones, in the meantime I'll have to make do with the Grover Rotomatics, just wish the Grovers didn't have a tendency to break certain strings when tuning up to pitch (the high E-string is the one most prone to breaking).
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