Mike: I was trying to understand from where the metal rolls up. If I formed them too well, where would the resistance be when driving the base onto the hooks?
BTW, Oskar used a laser bore sighter to help align the rings. I assume one that fits in the chamber. He pointed it at a distant object and determined if the rings were well positioned with a scope laid in them, and the centered scope being moved by fitting to zero in on the laser mark. It wasn't a bore sighter that fits in the end of the barrel and looks back at the scope...and he did a neat job that resulted in a good group. (super schussleistung!) Your rear block with elevation screw just makes really good sense, though, and I would have done that had I known. It would have saved me some time.
Oskar, keep us abreast of your drilling repair project! Steve