I wanted these to work but I was only able to get one working just okay. I degreased them to get off the factory coating and then lubed with super lube oil (not the grease) and 2 of 3 were still catching all down the rail so I took the one that worked okay and degreased again and tried new bearings which made things worse so I put the old bearings back in and relubed with 3 in 1 oil and slide the carriage back and forth while lubing intermittently to hopefully wear in the rail. About 30 minutes later I had it sliding under its own weight on the center of the rail which was good enough. Degreased again and lubed again with super lube so hopefully it will hold up. Returned the other 2, seemed like the beatings on those were to large they just drag down the rails.
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