I've been using a Renzetti for the best part of three decades and would feel lost without it. But, I never tied in huge quantities and certainly never commercially.

I have a #18 Royal Wulff that I watched Lee Wulff tie for me personally with, you guessed it, no vise at all just his bare fingers. Quite an impressive feat which I'll never forget. (And the man's fingers were as fat as sausages.)

"You can lead a man to logic, but you cannot make him think." Joe Harz
"Always certain, often right." Keith McCafferty