How to fix this bolt hole

['65 chevy lover]

Well, I checked on both the plastic license plate insert and, the metal clip nut to fix the bolt hole. The plastic insert was for a #8 or #10 screw and wasn't compatible with a 1/4x20 bolt. I could get a metal clip but would have to purchase 25 of them. So I ended up using a square nut with 1/4x20 threads. I had to slightly enlarge the hole with a small file and, made it a snug fit. I left about 1/16th of the nut sticking thru to be able to get a good weld on it. It doesn't look as good as I wanted it to but, it's covered up by the door panel. I started cleaning it up with my 4" grinder and, it was too big. That's why you see the gouge in the door. Ended up using my dremel to finish it. I put a quick coat of primer on it and replaced the panel. Only took me about 15 minutes from start to finish.