Detail 01
Adjustable open gears and die-cast plates
The die-cast plates are designed to maintain gear alignment.
Product detailSKU #1500000429861
GroverProfessional Mandolin Vintage A Style 409 Series Pearloid Button Tuning Machines Nickel
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Independent shopping perspective
The Korena take
Nickel hardware and pearloid buttons set the appearance of these Grover 409 Series Vintage A Style mandolin machine heads. Adjustable open gears sit in a modern worm-under configuration, with die-cast plates designed to maintain gear alignment. The 18:1 ratio allows precise tuning changes, and bell-top button screws continue the vintage-focused styling. Mounting dimensions are listed as a 25/64-inch post hole and 30.3 mm overall post length, giving you clear measurements to check before fitting.
Strong match
Who this is for
- Mandolin installations matching the published 25/64-inch post-hole and 30.3 mm post-length measurements.
- Precise tuning adjustments from adjustable open gears and an 18:1 ratio.
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
18:1 gear ratio
Allows precise tuning adjustments.
Detail 03
25/64-inch post hole; 30.3 mm overall post length
These are the published mounting dimensions.
Final check
Know before you order
- 01Verify the 25/64-inch post-hole and 30.3 mm overall post-length measurements before installation.
Product questions
Before you decide
Straight answers to the questions shoppers most often ask about this product.
01What mounting dimensions are listed?
The machine heads specify a 25/64-inch post hole and a 30.3 mm overall post length.
02What finish and buttons does this version have?
It has a nickel finish with pearloid buttons.
