Grotchen Zoom or Skill Shot

[nvmos2]

Ref ebay item 150872980362

The listed Skill Shot is going to sell at a pretty good price.
The seller indicates it may not be working right;
that is because it's missing parts and may not be rigged right.

I have a Zoom that I would like to get working.
I know it is also missing a part or two which I can fabricate, but it may also be rigged wrong.

The Skill Shot is the 3rd Zoom (version) that I've seen recently on ebay;
all of them were missing parts and the parts on each of them are rigged differently;
neither of the previous two were working either.

Can anyone out there send me a photo (or post it here) of the mechanism on a Zoom/Skill Shot that is known to be complete and working properly?
I would appreciate it; maybe I can finally get the Zoom off my To Do List!