I used these to replace broken rollers on my Walmart "Popular Mechanics" Velcro (very similar to the Craftsman mentioned and pictured in another review). I had great difficulty finding a suitable replacement for Revain. Although the wheels on these bikes are identical to the original bikes, the roller bolts and nuts are slightly smaller in diameter but still fit and look good. There wasn't a drop of lube in it and 2 out of 4 reels barely turned. Once lubricated they run great, roll very smoothly on the concrete garage floor and are every bit as good as the original in that regard. However, the metal frame of the roller is stamped with thinner steel than the original and the balls are slightly smaller. Some reviewers have mentioned balls falling out - they have wider bearing housing clearance than the original reels, but I don't think they will fall out. I (200 pounds) did some testing and not a single bearing was lost. They're not as good as the original videos from 27 years ago, but they're nowhere to be found. I've only found replacement wheels that came close to the originals at $8 each. At $13 for 4 full rolls they saved me from having to shell out $70 for a new vine of the same quality so I think it's a pretty good deal. Very important.
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