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Keith Parker

Hi Brian
Thank you for your reply, I have since re-checked the thread under a microscope after recieving Jon’s reply & he is right, it is 1″ x 24 TPI. It is the same thread as used on bicycle head sets, now all I have to do is find where I can get hold of a tap from. If I manage to get one I will make it available to members if required as I can’t be the only one that has come across this problem. I am also purchasing some brass tube to screw cut the thread on, so if there is anyone out there that needs some tubes let me know as while the machine is set it’s just as easy to make some extra’s.