In a message dated 3/4/2012 6:29:27 PM Central Standard Time, TR3driver at ca.rr.com writes: > 4BA, I think. Might be the wrong number, but they are definitely BA, not > UN/SAE threads. > > Thanks. Um, I just checked my favorite hardware store (McMaster Carr) and it seems they don't carry any BA taps. Where can one acquire one? Thanks again. Dave