Driven by irrational exuberance.
Pardon my ignorance, but there's one thing I can't figure out about rotating vises. I haven't used one. Let's see if I can explain it: if you're rotating the vise to wrap on some material like wrapping up a body, what's the tying tread supposed to do? Do you tie it off and hold it off to the front or do you let it wrap too as the fly rotates?