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Concertina Hold Down Bolt Threads
RP3 posted a topic in Instrument Construction & RepairIn replacing the chamois on the ends of a Jeffries, I discovered how poorly aligned the holes are that are drilled in the little pieces of brass that the end bolts screw into. I think these parts are called "sets"? Does anybody know the thread sizes for end bolts on vintage Jeffries and Crabbs for instance. And are they the same as Wheatstone threads? And finally, are there any sources for suitably sized taps and dies? Thanks, Ross Schlabach