John,

Or something arbitrary. Like others I collect odd taps, dies, and screw 
plates. When repairing an antique clock it is bad form to make the clock 
fit the repair part. I once bought an early electromechanical clock that 
was missing the screws that secured the dial to the movement. Looked 
like all I had to do was make a few 2 x 56 screws and I would be all 
set..... Only they were too big. Sometime later I stumbled on a tap and 
die set which included the 1 1/2 x 56 threads needed.

If you can post the photos or measurements described in earlier posts I 
suspect that someone on the list will have something suitable.

Troy