What is the least hardware that is needed to do a fair quality bend in steel tube?

I've tried to work it out, but there is such a bewildering choice and price range, I'm a bit lost.

I have a task that involves about 300 bends in 16mm tube.

If a good simple design exists for a bender that can do various radii as well as tube diameter, I'd consider making it, but would prefer to buy one.

Thanks,
Jordan


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