I read a recommendation somewhere about balancing the GM rotors and wheels together as a unit. Seems that some of the rotors currently on the market are WAY out of balance. My guess is they're Chinese imports. Probably doesn't effect a heavy sedan too much, but plays heck with a light T.

The old spin balancers that spun the tire on the car are getting hard to find. I guess you would have to rig something up on modern balancing machine to do this.

I also read that the SoCal Speed Shop won't let a car go without a steering dampener, just to be on the safe side. Of course they also sell dampeners!

BTW I think your son will like the TIG after he gets used to it.

Mike