Quote:
Originally Posted by The Ginger
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I agree with cmwilson13, it looks like you used superglue or Loctite on these.
Some plastics react badly (called crazing) to superglues (CAs in particular) and Loctite.
The bearings should be a slight press-fit into those pullys and should not need any glue. If they are a little loose, use a fender washer and spacer to keep them there.