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I have straightened bent electric motor shafts with a very close fitting tube.
Slide the tube over and it will stop at the bend, a gentle tweak and the tube will slide on a little further, another gentle tweak and it will slide on a little further again... and so on. It's done when the tube slides easily past the bend.
This is good enough to allow bearings to be removed and reinstalled, your mileage may vary.
Gentle is key.
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