Sheaves (a.k.a. pulleys)

[Tonestack]

I am slowly but surely building my winder. I mounted the bobbin shaft bearings this evening (Nice 6906 3/8" flanged bearings). To my surprise, one of the sheaves that I had in my junk box has an enormous amount of wobble. The bore is oversized enough to shim, but the wobble is too great to shim out. I ordered this particular sheave several years ago from McMaster-Carr. It looks like it was manufactured by Chicago Die Casting. I ordered several 3/8" bore sheaves in different diameters from another supplier earlier today. If these sheaves wobble like a wino after a hard night of drinking, I am going to look for machined sheaves.

[David King]

Well, I'd still be tempted to try and return them to McMaster Carr but it's probably too late for that. If you don't mind loosing a bit of diameter you could just have the wobbly pulley re-machined on a shaft mounted between lathe centers.
Consider getting toothed pulleys off ebay.