Good thing you took it apart, that much movement with the servo/coupling trying to hold it will destroy one of those expensive parts. Standard tac20 thrust bearings, so that's good. Should be just reverse for assembly. The bearings are ground for preload. The new universal grind bearings may take some fitting, as they tend to be about .0012" smaller in width. The end cap with the bolts may have to be modified for this. Not a big deal if you have access to a lathe. If you do need to make the "step" bigger, face both surfaces in the same setup so they remain parralel.

Sent from my SM-T813 using Tapatalk