The nut should be welded inside the frame.
Yeah I was thinking cut a hole with a hole saw/die grinder/sawzall, weld the nut fast, and then weld a patch over the hole.only way to do it right is going to be to cut holes in the frame and better weld the nuts in place. they must have tack welded them on a friday afternoon before a long weekend...that bad. i knew i couldnt be the only one.
The nuts may have been welded in place before the two halves of the frame were boxed together and welded.Well they got a welder in there and a arc welder would be the easiest to get in there and hit a tack on it but I like mig welding cause it is easier to start the bead and can run a bead without running out of rod lol