Finished! This is almost all GLUED together. You have to measure well! It doesn't ever farking leak but there's no backing out when you're putting each piece together.

I added an additional threaded junction so it should be possible to completely take the trap off, although I can't imagine why anyone ever would. The tub is old-school cast iron surrounded by well-installed tile, it all still looks like it did when it was installed in 1956. And it will still look good 50 years from now!!

I've had houses of all ages, so I'm definitely familiar with the 1910 - 1920s construction, most of which still works FINE. And I LIKE it!!! So this tender young house, a mere bud from 1956, has my suspicions, but it's basically built in the same old-school way as the other stuff that lasts a REALLY long time.

That's how America used to work. That's what American quality should STILL mean. Then this guy Reagan got elected in 1980... We've been gleefully outsourcing our manufacturing ever since.