Detail 01
18:1 gear ratio
Provides fine tuning adjustment control.
Product detailSKU #1500000429784
GroverMid-Size Locking Rotomatics 406 Series Tuning Machines Nickel 3+3
1/2
Independent shopping perspective
The Korena take
Grover’s nickel 406 Series mid-size locking Rotomatics pair smaller buttons with a locking string-post design. Feed each string through its post hole, pull it taut by hand, then tune: the locking cam engages first, after which the post turns to bring the string to pitch in under a full rotation. The 18:1 ratio provides fine adjustment control for dialing in tuning during practice and performance.
Strong match
Who this is for
- Restringing a 3+3 or reverse 6-in-line guitar using a locking string-post workflow.
- Players who want smaller tuner buttons while retaining 18:1 fine tuning adjustment.
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
Locking cam string post
The cam turns first to lock the string before the post begins bringing it to pitch.
Final check
Know before you order
- 01Confirm your guitar uses a 3+3 or reverse 6-in-line tuner layout.
- 02Installation uses strings passed through each post hole and pulled taut by hand before tuning.
Product questions
Before you decide
Straight answers to the questions shoppers most often ask about this product.
01How does the locking system work?
After the string is inserted through the post hole and pulled taut, turning the knob rotates the locking cam first. Once locked, the post turns to bring the string to pitch.
