
The PSA part is that I have moved away from using used bearings in my builds as in the last 12mo or so I have seen very few that I would trust to last the duration. Spalling (deformation or erosion of the metal of the race) is happening to these 40yo bearings, as to be expected. I am seeing at least minimal amounts of this condition on all of the bearings that I have been harvesting. It is no confidence inspiring to use these.
So, I highly encourage everyone to get new bearings. The slider is nice to offer, but the bearings are most important.