Roller Bender for square tubes

[Bullet500]

I finished the bender after using it to make the wheel to operate it.
The picture with the square tube was a trial to see how far it was able to bend a 25x2 mm square tube.
This is about R=300 mm but deformed to a trapezium shape as was to be expected.
The radius I want is about 1500 mm so that should be no problem.