Grover F-Style 309 Mandolin Tuning Machines

These are very smooth tuners, but beware in the installation thereof! The bushing recess is advertised as 11/32". I used a twist drill in reverse to ream the recess, and the bushing was too loose. I then used a 21/64" twist drill, and got the perfect fit. A word to the wise. I managed to build up the loose fit by gluing a ring of paper inside the too-large hole, but if you use a bit, use a 21/64" run in reverse to prevent its digging in.

My Collings F5 went from a tuning aggravation to a dream!

These tuning machines were a direct replacement to the stock machines on my MK mandolin, which uses 'worm over string post' tuners, except for a few screw holes. The only drawback is that the tuners work the opposite way compared to the originals, i.e. clockwise to tune up on the lower strings side.

I guess Grover uses the same parts for 'worm over' and 'worm under' models, and the worms are made primarily for the 'worm under' model. Nevertheless the tuners are of top quality, with a smooth and precise action. For a mandolin this is very important due to the high-tension of the strings and micro-metric tuning requirement. Thanks to Stew-Mac for the fast shipping!

I recently bought an Eastman F-Style Mandolin. Although it was their entry level model the tone and projection were brilliant. The downside was that they maintained a budget price by reducing the adornments and fittings - especially by using cheap, rickety tuners and the instrument wouldn't stay in tune. Also getting each string up to pitch was a hit and miss affair.

Stewmac and Grover came to the rescue with some matching worm under string post tuners. The action is positive and precise and the instrument stays in perfect tune over much longer periods. I am extremely pleased with them and Stewmac's speedy, transatlantic delivery.

I recently purchased a set of Grovers Tuners for my Savannah mandolin, boy are they nice. They look sharp, and make tuning up the mandolin a lot easier. So if you are considering getting a new set of Tuning Machines, go with Grover, and you will be pleased.

The "NEW" redesigned Grover tuners are not the same as old style Grover tuners. They are sloppy and are assembled without the post springs which make them sloppy in the holes. They rattle like a baby rattle! Sorry but I won't use these tuners again until they start reinstalling the springs.

I bought these tuners to replace the Chinese tuners on a Morgan Monroe mandolin. Most of the holes lined up, had to drill two new holes for each plate. The tuning machines work great, much better than the originals.

These are excellent tuners that perform just as good as the $400 and up tuners. Great product.

Installed on friends mandolin spacing was direct replacement and they work great. Well made.