Maybe I'm not picturing this correctly but couldn't you weld a piece of flat stock to the nut so it couldn't rotate and it could just float around in there until you tightened it?
Or, if you have a housing for a captured nut mark it's perimeter on the underside of the frame and drill a few holes that you can fill with spot welds from underneath.
__________________
69 Charger. 438ci Gen2 hemi. Flex fuel. Holley HP efi. 650rwhp @7250 510rwtq @5700. 95 F355. 96 Carrera 4S. 59 Cadillac series 62 convertible.
|