Chris, If it's an all-metal NR coinmech, it's mostly electro-mechanical & quite a "piece of work" in it's own right ot work on, I could bench test it for you if you're in the neighborhood & I have a few parts units ( as you've seen!) you might be better off using it as a door stop. once the stepper relay goes wonkers on these mechs. all you can do is try to transplant on from another unit.
Hows about a nice MARS 6800 series that can be set from 5 cents up to $6.25 per vend? I just repaired 4 units. or a standard Coinco S75-9800A or B