Check this out! A client came in with a sticky seat post, and our mechanic twisted the saddle (by hand, on the ground) and the whole seat tube rotated. Backing it out a bit, I only found one patch of clean brass and a few threads along the border of the lug. There was some other brass in the joints, but only a bit and it was coated in ages of rust.
This thing must have been held together by paint and rust for a decade.
I know that factory lugged frames being poorly made won't surprise many, but DAMN.