On Sun, 29 Jul 2012 07:25:23 -0700 (PDT), phaedrus
wrote:

No, it's not a pipe thread; very much steeper taper than a pipe
thread...

One such as I refer to appears in South Bend's handbook, How to Run a
Lathe at p.82. Sorry I have no facilities to upload a scan of the
picture.

http://wewilliams.net/SBLibrary.htm 44 page booklet.
P.82 does not compute. Was it another handbook?

(Unfortunately, I probably can't help you but I'm curious, just the
same.)

--
It takes as much energy to wish as to plan.
--Eleanor Roosevelt