Hey Hairy, Im sorry to hear you are having problems with your TC6.1. I personally dont believe you should sand a c-hub. I notice the same Issue on my car and all I did was squeez the ball ends and did the trick. Im working on replaceing all the ball joints with the gold ones just to free everything up. Look forward to racing you again Bro.....

Me and my TC6 eat Xrays for lunch