Much appreciated!!! I hadn't seen your reply and was researching earlier, your info confirms what I was looking for.
Thanks!!!!
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Catch22, as in your area 4BA material is not going to be available on every street corner, you might find it easier to obtain a UNF #6-40 screw! Although the 4BA has a 38.5 tpi thread, a #6-40 should be quite feasible over the short thread length that is being used. Oil it well and ease it in.