Detail 01
18:1 lubricated gear ratio
The tuning mechanism is specified for smooth, accurate adjustment with minimal backlash.
Product detailSKU #1500000429995
GroverRoto-Grip Locking Super Rotomatics 509 Series Tuning Machines Nickel
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Independent shopping perspective
The Korena take
Grover's nickel Roto-Grip Locking Super Rotomatics 509 Series tuning machines secure strings with a thumbscrew at each post, streamlining string installation and removal. The lubricated 18:1 mechanism is specified for smooth, accurate tuning with minimal backlash, while the three-step button defines the look of the set. These tuners are intended as drop-in replacements for a range of popular tuner models. Before beginning the swap, verify that the instrument uses the required 25/64-inch post hole.
Strong match
Who this is for
- Guitar maintenance where quicker string installation and removal is wanted through a locking thumbscrew mechanism.
- Replacing compatible popular tuner models after confirming the instrument has a 25/64-inch post hole.
Consider the trade-offs
When to look elsewhere
- Instruments that do not match the required 25/64-inch post-hole measurement.
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 string lock
The thumbscrew secures the string at the tuning post.
Detail 03
Nickel finish
This version has a nickel finish.
Final check
Know before you order
- 01Confirm the 25/64-inch post hole and compatibility with your existing tuner layout before treating them as a drop-in replacement.
Product questions
Before you decide
Straight answers to the questions shoppers most often ask about this product.
01How do the strings lock in place?
A thumbscrew mechanism secures each string at the tuning post.
02What post-hole size is required?
These tuning machines use a 25/64-inch post hole.
03What is the gear ratio?
They have a lubricated 18:1 gear ratio, specified for smooth and accurate tuning with minimal backlash.
