Decided to see if I could use a standard tap and die on an acrylic rod offcut... idle hands ya know. Then I just had to use it on something, so I made a snuff jar. The body was made from a briar reject block with a crack on the stem. The threaded pieces wouldn't fully thread together, need a bottoming die, so I turned a mahogany spacer from yet another scrap.
For what it's worth, I found coarse threads cut better. I suspect the threads would be much better with tooling that hasn't been abused for 4+ decades.
Briar snuff jar
Re: Briar snuff jar
There is more contact with finer threads hence greater friction. You need plenty of lube.