Ed had said that he wanted to press/punch the loop out of his junk Luger gripframe. I would be interested in seeing the inside of the frame where the loop holes come through. Just to see if the holes were chamfered. That would eliminate the need to swage the ends. They could even be slightly loose in the hole and still not come out, if they were peened or even just hammer-pressed in place and then the ends ground or milled.
Someone
(might have been Ed again) said that they had observed loose lanyard loops. That they hadn't fallen out leads to belief that the inner ends were bigger than the holes.
We need pics.
