Yea thats the black one. I have the golden metal one and it has a different "rivit" . Plan on getting the scope in there this weekend.
If its like one I finaly found online it may be a shoulder bolt with a hex on other side.
If not thats whats it getting when I determine its all coming out.
My guess is that I will need to follow a rule told me years ago. Fix it right or fix it over and over and over and over.

Will advise with pictures what I determine.