Tormek Motor Repair

I have used and loved Tormek grinders since 1999. My current machine is my second. (I sold the first one about 2008.) I acquired it from Highland Woodworking several years ago when they replaced it (the old "Super Grind 2000") with a new T8 in their seminar room. I use it for planes and chisels, carving gouges, kitchen and sloyd knives, and occasionally planer knives. 

Recently it began sounding bad, and way too loud:

I took the wheels and axle off to isolate the motor and make sure it wasn't something caught in the bushings the axle rides on, or the inside wall of the leather strop wheel where the motor shaft turns the whole works around. Nope, definitely a noise from the motor.

I wasted several