These guitar machines are a triumph in engineering and style. The housing provides a maximum bearing for worm gear and string post. Gear ratio is 14:1. Worm and gear are precision-cut for perfect meshing. This eliminates backlash and slippage. Countersunk tension screw permits players to regulate turning tension to any degree. Gear box has a special lubricant for lifetime, trouble-free service. Includes 5/8' washers, bushings and wood screws.

The introduction of the new Grover locking Rotomatics™ gives 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 than one revolution of the string post, you will be in tune, to stay in tune.

Planet-style, friction tuning pegs, 3/8 inch shaft. Nickel plated with black plastic buttons.

Standard 4+4, for A style mandolins: these new mandolin machine heads feature a die cast base. The rigid base is ideal to insure correct gear and worm alignment as it aids in maintaining the center lines of the critical parts. A wide bearing surface over the worm gives added support and enhances the smooth action on these machines. Screw and bushing provided.

Standard 4+4, for F style mandolins: these new mandolin machine heads feature a die cast base. The rigid base is ideal to insure correct gear and worm alignment as it aids in maintaining the center lines of the critical parts. A wide bearing surface over the worm gives added support and enhances the smooth action on these machines. Screw and bushing provided.

Grover Banjo Bridges.