The fix was pretty simple once I got the new T-bushing (8546462) and clip ring (W10083200). I would not have known these part numbers without this forum as they are not usually shown separately in diagrams or the normal parts offered for this model.
Getting the old one out required pulling the motor and transmission to get access. I then took a hacksaw blade, wrapped up one end so it would saw the old bearing and not my hand, and inserted the other end inside the spin tube shaft hole. This allowed me to saw through the wall of the old T-bearing in two locations (see the picture) and it finally came loose. I just stuck my finger in the hole and pulled it out. You have to watch actually sawing into the steel shaft but even if you knick it up some it doesn't matter since the replacement T-bearing will cover them all up.
I then put the new T-bearing in place by tapping it in with a hammer to wood to bearing approach so as not to mar it. It went in pretty easy, put the cam driver and clip on and reattached the motor. Ten minute job once I got the parts.
I think the bearing got ruined by me improperly putting the spin tube thrust washer on when I did a clutch replacement a year or so ago. I suspect this T-bearing would normally last a good long time and would never see the kind of wear this one did without some sort of pilot error being the root cause.
My quality of life is now restored........