I had to fill in the original holes for the machine heads because the mandolin is 107 years old (they were exactly one inch apart and 15 to 1 gear ratio). So I bought the jig as well. After re-drilling the holes for the new Grover's which are 18 to 1 gear ratio and replacing the pick guard and refinishing the mandolin with a french buff shellac finish it turned out fantastic. The Grover's are so much better than the original machine heads (which must have been hand made) I would recommend these to anyone.
So far I've replaced the stock tuners on one Breedlove mando and a Collings mandola. The Grovers are excellent, and the 18:1 ratio is really helpful for tuning precision. Beware - if you're picky about aesthetics, the Grovers hang off the bottom of the headstock on both instruments about 2mm. Some might consider that unsightly, I don't really care 'cause they *work* and I'm no longer fighting my tuners. The other visual issue (as mentioned by other reviewers) is the tuning shaft 'stickout'. I happen to like both the look and better access to the key, especially on the Collings with the concave shape of the peghead sides. The only mounting hole to line up on either instrument was the center one. I drilled both for the next pair of holes out from center. Outer holes on both are unused because the stock holes are just far enough out to a)not accept screws properly, and b)not allow enough material beside the existing holes to drill new holes. Works for me, but a 'proper' install is going to require filling and redrilling for the outer screws. Fair warning.
They are good quality and work well. The base plate is large so be careful when profiling the back of the neck.
These have great gears and tuning performance. The main issue I have with these tuners is the overall look is over-sized and just don't look right on a mandolin. The reason is the base and tuner shafts are about 3/16" longer than every other tuners available. The plastic pearl buttons also mediocre.
very suitable for Bouzouki & mandolin
the weight is just right & the price good & tuning is very smooth
Great - I use these type of tuners for making Mandolins and Boozuikis. The weight is excellent, and the keep the tune for a long time. Superb! Attached is a photo of what we are making with them. Cheers Bernie from Donegal Fiddles, New Zealand
Excellent fit and finish. Could not ask for better at that price.
Looked great on the mandolin. High quality tuners at an afforable price. Staff easy to work with and orders arrive very quickly.
High quality machines with a fantastic eye impact. In my old mandolin I did not have to even adapt the holes. Perfect fit!
I bought these tuners to replace the tuners on my mandolin. They work great! The tuning is very smooth, installation was pretty easy. I just had to drill some holes for the mounting screws.
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