Detail 01
Adjustable worm gear and die-cast plate
They are engineered to maintain the gear and worm center lines for correct alignment.
Product detailSKU #1500000429790
GroverProfessional Mandolin A Style 409 Series Pearloid Button Tuning Machines Chrome
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Independent shopping perspective
The Korena take
Grover’s chrome 409 Series machine heads are made for A-style mandolin tuning. Their adjustable worm gear and die-cast plate are engineered to keep the gear and worm centered and aligned for precise tuning. The 18:1 ratio allows very fine pitch adjustment, while the open worm-over gear arrangement is intended to make tuning quick and straightforward. Pearloid buttons and bell-top button screws complete the vintage-influenced look.
Strong match
Who this is for
- Setting precise pitch on an A-style mandolin with 18:1 fine tuning control.
- Players who want open worm-over gears and pearloid-button styling on their mandolin.
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 very fine tuning control when setting pitch.
Detail 03
Open worm-over gears
The gear arrangement is designed to make tuning quick and easy.
Final check
Know before you order
- 01Confirm your instrument is an A-style mandolin.
Product questions
Before you decide
Straight answers to the questions shoppers most often ask about this product.
01What provides the fine tuning control?
The 18:1 gear ratio provides ultrafine tuning control for dialing in pitch.
02What styling details do these machine heads have?
They have pearloid buttons, bell-top button screws, a chrome finish, and open gears in a worm-over configuration.
