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There is one cheap way. What you need is a really heavy wooden platform and two long stout nails hammered in so that they won't move, even when you stand on them, spaced about 3.5 to 4" apart, and some old cloth.
Wrap the nails with plenty of cloth to protect the thread
You place the threaded rod between the nails, and pull it so that it gets wedged between the two nails, and slowly put the bend in it, moving the threaded rod to adjust for the radius that is needed.
Do it slowly. It may also help to draw a template to the radius you need to check on your progress.
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