The top right hole on the RSP is the upper trunnion rivet hole. this holds the trunnion in place and I would think it's pretty important. why not grind it out "V" pattern and weld it, then dress it down?
I am thinking that he refers to the long .200" rivet that goes through the front of the top plate, just behind the top feed cover. I've seen that on some 1928 side plates. It should be ground and welded like bigmike suggests. That's what I would do, as much to make sure it doesn't worsen as to be secure in the strength of the assembly. Cracks like to grow!
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