Help! One of the tiny screws on the release plate on my Speed Graphic Pacemaker came out today and is lost. According to the diagram, it’s part #56 and it doesn’t give a size for the screw All it says is, “Screw-machine-special” Where in the world am I going to get a replacement? All ideas welcome. The shutter release is real shaky with only 1 screw holding it in place.