Jim Chandler wrote:
Archi:
What part of the Unimat head stock are you calling the "stem"? I have
my owner's manual here and once I figure out what part you are referring
to I might be able to help.

The round one going down from the main casing - to be clamped to the
base. This is the e-bay picture of it -

http://cgi.ebay.com/365-Unimat-SL100...pho tohosting

or here if long link would not survive -

http://www.podzam.com/images/3d88_1.jpg

Thank,
Archi