Here's the quote from Super 16 Inc:
We are no longer taking in any new jobs or answering technical questions via phone or email but hope that:
the folks at Visual Products can help you with most 16mm equipment and adapters, etc., on this side of the pond
and Les Bosher across it.
For Russian equipment, you could try Olex Kalynychenko at olex.camera@gmail.com or http://slowmotioninc.com.
Andrew (Andrzej) Zorawski at AZ Spectrum repairs motors and provides video taps;
Dave Kutz (717) 587-9039) in Lancaster, PA, does focus gears for lenses;
Shurco Tool in Covina, CA, does photoengraving for ground glasses.
Jesse at Chambless Cine Equipment has parts for Bolexes, Beaulieus, and Super 8 cameras.