I put another 6 miles on the car today. I pulled the motor and removed the clutch disk. 5 of the 6 springs on the clutch disk were broken. Some of the springs were broken in multiple places.
I put the centering ring on the pressure plate. Installed a new clutch disc, throw out bearing, and clips. Car runs strong. The clutch chatter is gone. Glad to have it on the road again.
What would cause those springs to break like that?