Damn this one driver is trolling me hard. Was fine yesterday but not so much today. The diaphragm measures fine when I take it out of everything, and the brass rings measure fine. I screw almost everything in, everything is fine. I screw in the final screw, it measures ~1 ohm. Something must be in there that is conductive and touching the two brass rings, I can't think of any other reason. But I can't see anything there.