We got it working. Still a bit precarious; I think we need to shorten some wires, as stuff is crammed in way too tight. We both have the inexpensive Trustfire charger, and it seems to have fried 14500s for both of us. We swapped them out with an 18650 (not ideal for the limited space in a Graflex) and it seems to be working fine.

Odd issue, though; when I push the blade all the way down into the blade holder (one of the Graflex adapters from the shop) it seems to trigger a power cutoff on impact. But if I push it down, then pull it out so it's not sitting right on the ledge (but still secured by the thumb screw) it works okay. Somehow, even though there's the ledge there, the blade is pushing down on something somewhere causing a power cutoff. Strange, but easily worked around.

Thanks, Lendo!!!