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5 mm Shaft Twin O-Ring Friction Drive Wheel
A 40 mm diameter, 24 mm tall friction drive or idler wheel for a 5 mm motor shaft. It has two 45° flared grooves that take 3–3.5 mm cross-section O-rings or heavy rubber bands as a replaceable tyre. It is locked with an M3 set screw and a captured M3 nut. Use it to rebuild a perished rubber-tyred idler-drive setup like the ones on vintage turntables, or as a rim drive for a robot, turntable or sample roller. When the tyre wears out you swap the O-ring and keep the hub.
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