I managed to stagger out of the basement after surviving hand to water heater combat.
Anyways, I see that James V. Howe in the book "The Modern Gunsmith" supposedly identified the screw size for brass round head screws used in lapping a muzzle.
I went through my electronic copy, but it isn't searchable (dow!)
Does someone have this info? Like to lap the muzzle on the old retrobate's 32-40.