Hi im currently cleaning up a 1972 Puch....in the process i've managed to strip the bolt that tightens the cone. took a trip to the LBS and was no help, same thing at Lowes. can anyone verify for me the thread dimensions? i know its fairly close to 24TPI but using the thread gage at work says a 1mm (25.4tpi) would be a better fit ..can anyone help?!?