2 Treble, 2 bass SELF ALIGNING THRUST BEARINGS!

Self-aligning thrust bearings! Special butterfly button. Durable cast housing. End thrust bearings. Worm meshes perfectly with gear. Safety-type string posts with cutaway shoulders to provide slip-over. Two screws in the housing apron provide greater holding power. It may be used with ALL modern bass guitar headpieces. Individually hand-tested. Screws and bushings included. 20:1 gear ratio.
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