on my turk the "screw" you menion was the same way peened over like it was a rivet, what I did after removing it was to replace it with the next bigger size screw10/32 if I remember correctly, tapping the opposite side of the band to match the new screw, but be careful the hole is oversized where it was countersunk and you won't have much thread depth to work with, in other words don't crank it down tight or it will strip your new threads.I also dressed the head of the screw by chucking in my drill and working it with a file to give it a short square shoulder while still being countersunk
Hank