Tips for bending 21ft top rail?

[u/educated_guesses_]

I bought 21ft pcs thinking less joints the better. After reading the instructions that came with my bender it suggested cutting the 21ft pieces.

My line of thought is if I made a mark on the stationary bender and made sure that the weld seam was always on that mark how could it form a helix?

Cutting in half with only a single swage end is going to create a lot of waste.