Bulkhead Connector Stripped Threads?

The gods above in the firmament just keep throwing monkey wrenches down atop me. Every day is another attempt at re-installing the motor in the '65 Formula S, but another problem seems to always present itself.

This time, I was attaching the two ammeter pass through wires at the main bulkhead distribution block when I found one of them would not tighten up (screw kept turning). Being this is a very key and critical junction, after my cussing session subsided, I figured I could just work a nut onto the other end. It is very cramped in there with power brake booster in the way and I did not want to take the screw out again.

So in order to determine what size nut to use on the screw, I removed the same bulkhead screw from the '65 Signet convertible parked nearby. I had an opposite problem there, the screw turned but would not exit. I found a nut on the other end. That's weird. To the best of my knowledge, the factory did not use nuts. If I am correct about that, I guess a past owner of the convertible must have stripped the threads also, just like me.

Sunday (tomorrow) the fastener store down the street is closed. Monday, I'll be at it again though. First photo is bulkhead connector for Signet, second photo is for Barracuda. It's funny the factory orientation for the Barracuda connector is rotated 90 degrees from the orientation of the convertible.

Last three photos show the screw/nut I removed from the Signet.

convertible  bulkhead pass thru.JPG

Barracuda bulkhead pass thru.JPG

pass thru screw 1.JPG

pass thru screw 2.JPG

pass thru screw 3.JPG