Grover 409FVN Mandolin Machines
Grover 409FVN Mandolin Machines, Set of Machine Heads for Mandolin, Tuning pianos of different lengths for vintage ""F""-style mandolins, Configuration: 4 left, 4 right, 4-On-A-Plate design, Mounting diameter with mounting sleeve: 8.30 mm, Distance between axles: 23 mm, Open, Worm thread above gear, Gear ratio 18:1, Round pearloid buttons, Nickel-plated, Delivery quantity: 8 pieces