Ive posted on this subject before elsewhere....but I cant remember if it has been brought up here.
Several years back I was up in DFW at the Social Smoke warehouse. They showed me a video of a guy spinning a hookah part out of steel. I dont know where to find a copy of that video...but theres some stuff on youtube where people are using the same method and tools to create different goods.
The parts are made for process called spinning.
heres a short video of metal spinning in action.