What thread is used on the wiping head end of my rod bayonet?
I finally found a wiping head but it won't screw on to the rod due to the threaded end being mushroomed out by some previous owners abuse.
I have started to clean up the threads with a small triangular jewelers file but think perhapse a die would be better. Comparing the good threads under magnification they just don't appear to be standard.
Could they be 1/4 - 26 Whitworth?
Any clues would be much appreciated.