I was talking with an old-timer in our car club and mentioned I was going to replace the chattering clutch in my '53 w/3-speed. He said loosen the clutch plate, tie off the truck to something solid like a tree, start it, put it in 3rd and let the clutch out. He said let it run like that for a few and it should get rid of the chatter.
I'm just curious, has anyone tried this?