Jerry,
I thought these were 2-56 screws which might be a bit easier to find. Your missing screw was produced with slotted flat heads and slotted rounded heads. Since either will be hard to find in a slot headed screw the size and pitch this issue is moot.
Another note on the 48's--I have been told that the windage screws and elevation screws for 48's were produced with different pitches through the long history of production so the taps and dies I got from Victor Machinery to make the windage screw for the damaged sight that I got for my 400 Whelen project are only for the version that I have. Fortunately Michael had the needed parts so didn't have to make a screw.
Ah, firearms archeology. Hope you are retired like me so that the quest for a little tiny screw doesn't make you crazy.
Dennis
