[ Ref. email from Tomek Budzynski in 060319 MMDigest ]

Tomek,  First, my apologies, I do not have an answer to your question.
Actually, I, too, am interested in how others obtain parts for such
antiques.  If you learn something, please copy me on the information.

From my perspective, I would think that you either need to cannibalize
another machine (which is difficult and potentially expensive), or
machine or manufacture the part yourself (which is also potentially
difficult and expensive).  I don't believe there are any shortcuts
available.  You might luck out and find that one of the master
restorers has such a part available, but finding him/her and obtaining
the component could also be time consuming and expensive.

Please keep me posted on whatever you find out.  Thanks.

Tony Stratton