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I did wind up having to grind off the bolt head. Since that fat washer was on there, I managed not to scuff the paint on the tunnel. The rivnut fell right out onto the floor--it was rusty and probably could not have been tightened. I managed to get another 7/16 bolt through the hole from...

I could be mistaken, but I think that's how the seatbelts were installed originally. At least the TM doesn't show installing the rivnuts in order to bolt the seat belts down... And rivnuts are safe enough for aircraft use. At the size we're talking (7/16x20) I think they're sufficient...

:-P Well, I've got one on order now. Not that I'll need it for this particular job, but I expect to need it again--maybe soon.

Good idea about the chisel. I'll try that tonight.

Nope. From the underside, I can hardly reach it with a wrench, so there's no way to get the end of a TIG up in there. It's just too narrow and too far up. From the top, that big washer is in the way. Good idea though--that was my initial thought: take it over to the college's auto restoration...

Yeah, I was just at Fastenall and they didn't have a rivnut that large. On top of that, I'm pretty sure the HF tool doesn't go anywhere near that big. And I couldn't get the tool on the rivnut with the bolt still through it, in any case. I'm going to try and get a wrench up in there again, once...

I think if I cut off the bolt (grab it with pliers and hacksaw off the head) the nut will just fall out. I hope.

Oh, rivnuts! (That's a swear word, for sure) Guess a rivnut tool and set of inserts is on my list. I seem to vaguely recall someone saying buying the truck was only the beginning. :-) Just a few more thousand to spend until it's set up to my satisfaction.

Thanks for the info. That's what I was afraid of. I don't think I can get to the inside of the tunnel without major disassembly--the frame runs right by there and there's about 1/4 inch of space between the frame and tunnel. It might have been possible to get the end of a wrench in there...

Like a bad penny, I'm back with another question. I got the rear seat belts installed this evening, but ran into a little problem that I can't seem to solve... On the passenger side, where the seat belt latch mounts to the tunnel, I can't get the bolt to tighten. It's just spinning. Looking...