Bought these for part of a wood milling project. 1 of the bearings came with free parts, oh wait those ball bearings should be in there. Well, good luck figuring out which ones. I tried some method but 1 out of 4 moved erratically - probably one didn't have its "balls". After repeated disassembly, a few more ball bearings fell out. They are incredibly small to fit back in. So I'm ordering replacement bearings now, but everything else seemed fine.
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