FWIW, there is an industrial tool supplier in Michigan that carries hundreds of threading tools that can produce about any thread you can think of, including these oddball #14-24 TPI drain plugs. Its the same place as I bought the 10-30 tap and die for making the Johnson rope sheave plate screws that get the slots mucked up (or lost by somebody else, but not you) so often. As soon as I can find the last receipt from them, I’ll tell you the name of the company.
PM T2
He's livin' in his own private Idaho..... I hope to go out quietly in my sleep, like my grand-dad did..... and not screaming, like the passengers in his car...