Shugart 800-8 media centering problem

[dwight]

It could be an indication of pot metal failure.
I had one drive that the spindle from the driven side was clearly
swelling. I replaced it from a spare parts drive.
What happens is that the metal has oxidation at grain boundaries.
It is said that it is caused by small amounts of contaminating
metals in the mostly zinc pot metal.
Aluminum has been said to be one of the problem sources.
Dwight