That hole isn't threaded, is it? Syracuse Lefevers have a threaded hole on the top strap in about that position longitudinally, but it is centered in the top strap and normally hidden under the top lever. There is a slotted set screw that, when run in, disables the safety when the gun is broken open and cocked. I've seen several Lefevers that have this screw hole, but the screw is missing.

A true sign of mental illness is any gun owner who would vote for an Anti-Gunner like Joe Biden.