I have a mkII that I inherited from my father. He had a small amount of
information from TENGA in 1992. That information simply comprises a brief spec
for the mkIII and some pictures of accessories (collets, boring head, clamps
etc.) and a list of companies which use the product. Send me a snail mail
address and you are welcome to copies of what little I have.
I don't have any collets (don't even know the official designation for the
BCA/Leinen collets) but I was planning to manufacture a batch from first
principals once I've got the new workshop built and the Hardinge commissioned.
If you do, somehow, get your hands on a manual I would appreciate a chance of
a copy, as would Tony at lathes.co.uk, I suspect.