Detail 01
Locking cam string post
The cam rotates first as tuning begins, locking the string before the post starts to turn.
Product detailSKU #1500000429791
GroverMid-Size Locking Rotomatics 406 Series Tuning Machines Nickel 6-in-line
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Independent shopping perspective
The Korena take
Grover’s Mid-Size Locking Rotomatics 406 Series pairs an 18:1 ratio with a locking-cam string post for a more direct restringing routine. Feed the string through the hole, pull it taut by hand, then tune: the cam locks first and the post subsequently turns to bring the string to pitch in under a full rotation. The nickel set uses smaller buttons while retaining the locking Rotomatics design, and is intended for 3+3 and reverse 6-in-line guitar arrangements.
Strong match
Who this is for
- Restringing a 3+3 or reverse 6-in-line guitar using the locking-cam tuning process.
- Practice sessions and performances where the stated 18:1 ratio supports precise tuning adjustments.
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
Provides the stated precision-tuning control.
Detail 03
Mid-size buttons
Uses smaller buttons than standard locking Rotomatics.
Final check
Know before you order
- 01Confirm that your guitar uses one of the listed 3+3 or reverse 6-in-line layouts.
Product questions
Before you decide
Straight answers to the questions shoppers most often ask about this product.
01How do these locking tuners restring?
Insert the string through the hole, pull it to tension by hand, and begin tuning. The locking cam engages before the string post turns.
02How much post rotation is needed to reach pitch?
The tuning process is described as bringing each string to pitch in less than one full rotation.
