As far as the flats that I wind up with, that isn't the biggest issue. I fabricate butterfly valves, 99% of the time the body thickness is only 3/8 of an inch thick. Almost always these bodies that I roll are stainless. 304, 316, 310. Sometimes A516 grade 70, we have done other things in order to eliminate the flats i.e. leave access, tack weld on excess and then just cut the tacks. The biggest issues I have with this particular roller I have is all the slop in the top roll. The top roll, which is about 12 in in diameter is only driven by the bottom two rolls. What I mean to say is just the bottom two rolls are gear driven and the top roll is just free rolling. So with the top roll being so sloppy and wore out it just makes it a real bear to try and roll anything. Like I said I just want to get something I can do these bodies right now, I plan on keeping the big roll and working on it to improve it but that's going to take some time. I will take some pictures of it and post it so you can see what I'm talking about. Mike