i did a repair on a FDC where the front screw was buggered, and stripped in the wood. I silver soldered a lug on the guard, and pinned it blind inside the lock mortise. I repaired the head of the screw, and riveted the inside so the screw would turn easily. Then, down the road, someone trying to turn out the screw just got one that revolved, but nothing happened. But no damage, and eventually, hopefully they'll figure it out.