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So, after doing some research I think the most helpful solution I can offer is a picture of various techniques and a link to a straight-forward, budget friendly tutorial. I think trying to explain anything in depth would be tedious and vulnerable to misinterpretation. It also appears that super glue, hot glue, and some pieces to sacrifice/modify will be ...


Had to buy one to check the specs. The Bore size is just under 4 mm (~3.5 mm) in diameter. Without the teeth of the clutch it is just under 5 mm.


Outer (hub): 6.8 mm/.268 in./ 17/64 in. Inner (shaft): 4.9 mm/ .193 in./ 25/128 in. Teeth (key): 3.32 mm/ .1305 in./ 17/128 in. -These are close/approximate, not exact due to the tolerances and/or wear. I measured 4 different gears with a digital caliper and the measurements were all within .10 mm of the listed measurements. The measurements even varied ...

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