I did some repairs to the repairs today! To complete an Amazon order I picked up a countersinking bit. A big cylinder with a sharp cone tip. I unscrewed the lever and brass screw and countersunk the screw in twenty seconds!
Trouble was, after this, there wasn't much holding the screw on there, no nut inside the sidebar, and very little metal inside the lever....
so I happened to find a 90% match ESB board that I'm going to save unless something big comes up and I can swap for it..the plug to that board was held on with these screws and a metal bracket...the same threading as these brass screws! I cut a chunk off and stuck it inside the graflex sidebar, tilted, to accept the lever screw.
it was hard screwing the lever on, leaving it loose and screwing the clamp screw tight, only to force the lever over the head of that screw and back into place...my square washer ended up crooked just like the real prop.