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A roller knob for import JMs and Jags with a grooved surface. WILL NOT FIT VINTAGE/AVRI GUITARS
You need a screw and a nut to mount the knob. You can use a screw from a regular roller knob or a saddle height adjustment screw, and a nut that fits the screw (thread size: M3). I have only tried it with import parts myself and cannot guarantee that it will work with US parts.