Detail 01
18:1 lubricated gear ratio
Provides smooth, accurate tuning adjustment with minimal backlash.
Product detailSKU #1500000429998
GroverRoto-Grip Locking Super Rotomatics 509 Series Tuning Machines Gold
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Independent shopping perspective
The Korena take
Grover’s gold Roto-Grip 509 machines use a thumbscrew at each post to hold the string, making removal and installation quicker during a string change. Their lubricated 18:1 gearing is designed for smooth, accurate adjustment with minimal backlash, while the three-step buttons give the headstock a distinct visual detail. They are intended as replacements for a variety of popular tuner models, provided the instrument’s mounting requirements match.
Strong match
Who this is for
- String changes where locking each string at the tuning post can speed installation and removal.
- Replacing compatible popular tuner models with gold-finished locking machine heads.
Consider the trade-offs
When to look elsewhere
- Instruments that do not use 25/64-inch post holes.
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
Thumbscrew locking mechanism
Secures each string at the post for faster installation and removal.
Final check
Know before you order
- 01Confirm that the instrument uses 25/64-inch post holes.
- 02Check that the existing tuner model is among the compatible replacement applications.
Product questions
Before you decide
Straight answers to the questions shoppers most often ask about this product.
01How do the Roto-Grip machines hold the strings?
A thumbscrew locks each string in place at the post.
02What finish do these tuning machines have?
They have a gold finish.
Reference
Full specifications
The complete catalog record, organized around the decisions musicians make when comparing gear.
1 detailsBody & build
- Color
- Gold
