well someones having a bad day or bad week or bad month, I have ordered and returned 2 of these in a row because of poor manufacturing, bearing is off center, and misaligned, apparently who ever is stamping these out, is allowed to drink beer on lunch hour, Or Sierra has no quality control program. ON both bearings I received it is so misaligned you can see it plain as day one side of the insert is about 0.1 inches offset from the other side. In other words if you spin it around it will wobble about 0.100 inches,