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Forty years ago I made a couple of endless screws for a musical box,
using a toolpost grinder which I made for the job.  I cannot now recall
the details of the endless screw: its threads per inch, the thread shape
or its depth.  Please, may I ask, does anyone know where I could find
these facts?

Years ago I had a number of articles from a USA musical box magazine
giving very good instruction in making endless screws.  That was in the
1960s.  Can anyone recall these articles?

Thanks,
Fred Longrigg - flongrigg"at"hotmail.com (replace "at" with @ to reply)