Inside threading project

South Park Marina calls for help, restoring a 1930’s cruiser, needs a couple of union nuts. Al to the rescue!

For some reason all the period correct faucets at Second Use had 16 TPI, all the unions were 14 TPI. Go figure!

Fortunately Alaska Copper had some brass hex stock in their scrap bin.

Image 1: A bunch of boring drilling and boring

Image 2 some threading, inside, blind:

Parting:

A little easing of the edges:

The finished product, times 2: