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.

 

These new Grover 309FN, professional model mandolin machine heads are the latest in technology. A specially designed, adjustable worm gear along with the die cast base maintains the center lines of the gear and worm to insure correct alignment for the finest mandolin tuning possible. The worm to gear ratio for the 309FN is 18:1. Available in “A”, “F”, and “F Vintage” styles. Screws and bushings are provided.