US PATENT NUMBER 6,078,001
Grover’s patented locking tuners have eliminated the obstacles of other locking devices. Since there are no external mechanisms to initiate the locking action, the machine head’s appearance is like any other. The entire locking mechanism is self-contained and Self-actuated.
ORIGINAL LOCKING ROTOMATICS® (106 SERIES)
The introduction of the new Grover Locking Rotomatics® give you the ease of use provided by a standard tuner and the positive locking of our internal cam post. Simply insert the string through the string hole, pull to tension by hand and begin tuning. As you start to tune, only the locking cam in the string post turns. Once the string is locked, the string post begins to turn allowing you to bring the string to pitch. In less then one revolution of the string post, you will be in tune, to stay in tune. Gear ratio is 18:1.
- Turn tip of string post until it clicks into place. This aligns string post holes.
- Note string hole is off center. Turn knob to rotate post util string hole is positioned away from the knob. Thread string up through bottom of hole and pull firmly.
- Turn knob to begin tuning. At first, only the inner “Locking Cam” is turning, securely locking the string. Once the string is locked, outer post will turn.
- Bring strings to pitch.