Thanks puff!!!
I use a pipe roller from Grizzly.... Click here : Grizzly G5771 - 50" Slip Roll - 16 Gauge
for the money it is quite the machine! it will roll round bar also. I use it mostly for flat stock. it will do 16ga full width but 1/8" material is a breeze as wide as 2"
They have some great tools as do so many industrial supply houses. I would love to have a few crazy tools like these in my garage and in fact, I do. But eventually, even a nutty hobbyist has to look at the practical side of things.
Make no mistake, there ain't no powder in this Puff ! And... I'm not really a crazy person but I play one in real life