I used the bunnings red wheels but left the rubber on (the rails had edges for guiding) but had the same problem with moulding ridges and bumps on them. I've looked at many cheap hardware store wheels , they are all the same, all required dremmel work to make smooth. They are cheap for a reason, not made for ultra smooth travel unforch. Smoothing them isnt easy either. I'm resigned to getting proper industrial ones now, when I get round to it.
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