I bought 3 used clutches and 2 were pretty rough looking. Found the 3rd in decent shape, air gap around .035, disc is about .125, doesn't look like any shims are left. We tested it down the road and it seemed ok. Took it to the track and made about 4-5 laps in the heat when the son pulled over unable to run anymore, engine still running he says it wont go. Swapped back to the drum clutch we had been running and finished out the night. I just checked everything again and noticed the inner edge of the weights have been ground down. Am i just to the point where it needs a disc or is something going on with the weights? I thought i should've been able to get a couple nights out of it based on measurements on bully website but knew it was pretty close to the end.