Ghost:
If you have a firm in your area that does micro-TIGing, for electronics or aerospace industries I think, they may be able to help you. I have a friend who had a Piotti with a buggered-up slot on the lock screw that ties down one of the trigger guard screws (Now you know how narrow those Italian slots are to begin with). He sent it to a micro-TIG welding firm, and darned if they didn't weld up the EDGES of that screw slot, so all he had to do was trim off the top of the head and straighten the sides of the slot. It was an amazing piece of work, must have been done under a microscope. Not cheap, In think it was around 50.00 or so, but way less than having a new screw made, fitted, and timed.
Craig Libhart