Thanks for the hint, Linkbelt. I have Wes's video. It's great. I tried the 3/8 npt tap method, and got the impression that it would cut the end off fo the tube before it broke loose.
My regular playroom includes a very nice and useful 1956 Southbend 10K.IMG_0725.jpg
...and a not as nice but almost as useful cheap chinee mill-drill.IMG_0724.jpg
I don't want to fit engine parts in the frozen darkness that the garage becomes, so it'll get built in the basement.The future holds much running forth and back for tools.