Review on 🔧 Optimized SCS8UU Linear Motion Bearing Bushing by Gopal Baltimore

If all 4 worked as well as 1 of these would be a 4 star purchase. As mentioned, not all of the mounting holes were drilled correctly - not that they weren't cut correctly, but that some of the holes were milled at the widest point of the rail. The screws still hold them in place, but a few bad holes have less than half the threads. That alone should have been my signal not to buy them. 3 out of 4 - junk. They aren't smooth when not under load, they feel better when you press them against the rod (force flattens the internal bearings), and they stick when you have a fast servo combined with a hardware plate that doesn't hold up evenly across all stocks.