I had the same problem with my left channel. I was able to slide an angle iron between the frame and channel. I drilled 2 holes in the angle iron and bolted the fiber glass sill plate to the angle iron using the body alignment holes.
This way I put the sling hooks on the angle iron.
Are you concerned about originality...if not...how about just welding in a stud into the sombrero nut, then just putting a nut on after the x-member is in place.
Or
use a Dremel and cut two deep slots in an X shape at the bottom sombrero surface right thru the nut. Then peel back the metal...
These aren't spot welds, these are plug welds. brackets have holes in them. These are welded in from the top.
I can't imagine how you would weld the sombrero in without taking the body off. I recently did a lot of work on my frame including this area.
The way I did it was:
-with the frame...
I have a very rough ProE model of a 73 frame that I am currently restoring.
But it is not accurate enough for anything useful. I was only trying to determine the center of gravity so I could build a frame rotissory so that I could rotate it easily without going lopsided.
I looked at the frame...
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