I think I got it figured out. It's 3.5x.8mm basically impossible to find and takes a 1.5mm wrench. 3.5mm is a few thou smaller than 6-32 and .8mm is 31.87 threads per inch.
I tried a 6-32 in the hole and it was a tiny bit tight but worked fine so, I'm going with 6-32 x 1/8th all around and a 1/16th wrench.
Anyway, thanks go to me, myself and I since none of the vendors emailed me back and, hope this info was useful to somebody.
MM