Detail 01
18:1 gear ratio
Provides fine control when bringing the mandolin to pitch.
Product detailSKU #1500000429796
GroverProfessional Mandolin F Style 409 Series Pearloid Button Tuning Machines Chrome
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Independent shopping perspective
The Korena take
Chrome Grover 409 Series machines for F-style mandolin pair open gears with specially engineered worm gears and die-cast plates that hold the tuning posts in alignment. The 18:1 ratio gives you fine adjustment while bringing a pearloid, bell-button look to the headstock. Their 25/64-inch post holes and included mounting hardware make the installation requirements clear for a mandolin setup or repair.
Strong match
Who this is for
- Mandolin setup work where the instrument uses 25/64-inch post holes.
- Players wanting fine tuning adjustment with pearloid bell-shaped buttons.
What matters in use
The specifications, translated
Catalog numbers tell only part of the story. These are the details most likely to change how this product feels, sounds, or fits into a setup.
Detail 02
Die-cast plates
Keep the tuning posts aligned with the worm gears.
Final check
Know before you order
- 01Confirm that your mandolin has 25/64-inch post holes.
Product questions
Before you decide
Straight answers to the questions shoppers most often ask about this product.
01Is mounting hardware included?
Yes. Mounting hardware is included.
02What tuning ratio do these machines use?
They use an 18:1 gear ratio.
