I've made an unconventional repair to a guard once where weld was run around the countersunk part then I used valve grinding paste to lap the screw back in after rough shaping the angle.
I need to get some of this valve grinding paste. It's use has been mentioned before.
Professionals may cringe but I used a cordless drill to carefully spin the screw until it sat at the right depth and could be timed.
There have been many methods we know about used to solve problems with guns, and many are likely still unknown. If they work, they work, professionally endorsed or not. With this gun, I'm just trying to make it a bit nicer than it was, for use for another 100 years I hope.
