Actually, I already thought of that, Pack Rat, but Todd sells them TWO SCREWS for $24.00😬, AND he is all out of them. Some how I did not think he would be too eager to give me the specs so that I could circumvent his sales.
In the mean time, however, with a little research, I was able to attain the correct screws, (plus a whole lot more) as part of an ASSORTMENT available from AFH Fasteners on ebay, (for less than the cost of those two screws), AND in a convenient plastic storage case no less!
Anyway, that screw turned out to be a #4-40 X 3/16 in case anyone needs that info for future reference.