The Super Rotomatic® has a 14:1 gear ratio. The 3 step button gives this machine a distinctive look and the sealed-in lubrication assures smooth gear-and-worm movement for the life of the machine.

Please Note: Grover tuning machines produced prior 1985 use different specifications for threading and shaft sizing. Current production replacement parts are not interchangeable on vintage (pre-1985) Grover tuning machines.