I have a Winchester Model 54 30-06, that has a Redfield peep site mounted to it. The elevation reference plate on the side of the site is held on with a pan head machine screw, that I think is a number 4. Does anyone know for certain and where I might find such a screw? Half of the head has broken off of this screw - not sure why or how, as it was fine when I put it in the safe and broken when it came out. The elevation reference plate stabilizes the site in the mount, so I need to replace it.