I added 1/4″x2-1/2″ braces, with a 2×2″ post to strengthen the spine. If that is the right word.
Also fabricated a wheel instead of a crank, for more precise control.
Turned out I really needed a “Tipping Wheel,” which did not come with this roller. So….. I made one. I used a 7/8″ ID sprocket hub, and the largest sprocket Princess Auto had, but then machined the teeth off. A tipping wheel is useful for forming flanges on sheet metal, and particularly good at curved flanges, which a sheet metal brake cannot do. As I understand it (and I am no pro at this), a tipping wheel works best with a soft wheel below it (I used a wheel from my street luge).
A stand was made using some large pipe I found on my property (holding up a basketball hoop), and an unused 16″ rim. I also switched the roller top-to-bottom so that the work is fed forward with a downward (more natural) pull on the wheel.