I’m restoring a 64 chev pu and the other night i was running a tap through the threads, on the body) where the door hinges bolt up. I was down to the last set, passenger side botom, and the thread or nut assembly broke lose from inside the panel. I have attempted to fish a wire through the holes and retrieve, but haven’t had any luck. Should I get everything in place and weld on the bottom hinge? Cut a section out, weld nuts to the back side, and weld it back in? I’d appreciate any ideas or suggestions.