And what exactly is going on when a bearing is on the brink of failure?
I've heard of a spun bearing, and have seen the results of that. Where a bearing seizes and starts spinning in the housing or on the rod.
I've heard talk of bearings starting to "knock" when they develop a problem. What actually causes that knocking sound? Is it the result of slop that has developed in the bearing?
What is it that actually causes a bearing to seize? Is it simply heat that causes the parts to expand to the point they actually weld together?