I've had two cases where I had clutch chatter & in one of them it had some center hub spring damage such as yours shows. In both of these cases of mine when I finally found & cured the problem, it was due to mis-alignment of the engine/trans. My most recent one was with a 292" 6-cyl. I swapped into my car. Used the same trans. I'd ran in the car for maybe 50K mi. with a 235, no problem. Long story short, a set of .016" offset block dowels to get it on center & a pair of .010 shims under the top trans. bolts to correct the angularity & its now a pleasure to drive again. Two clues I had-it had excessive pilot bushing wear & when shifting from nuetral to rev. it would try & grind the gears. No matter the disc was releasing OK, it would not 'coast down'. All this is fixed now. If you had these symptoms I would recommend getting a dial indicater & checking the alignment. Doug
