The last several Sankyo music movements (18 note) that I have purchased have come with wind-up keys with threads that will not screw completely on to the shaft of the music movement. A simple "cleaning" of the female threads of the key with a "thread tap" would solve the problem, however, I have been unable to determine the thread size. I've asked 3 suppliers and they have no idea what size the threads are.
Is there anyone who has made a key extension and cut the male and female threads for the extension?
Thank You,
Roger