I'd be careful with the long lever approach as you can easily apply too much pressure and bend it the other way.
My advice:
1. Put a ring of masking tape around the shaft
2. Roll the shaft on a flat surface to find out where the bend is and mark it on the tape
3. Wrap the shaft in cloths, or sandwich it between two pieces of softwood in a vice and using another piece of softwood, gently tap in the opposite direction of the bend.
4. Take of the vice and repeat steps 1-3 above until you straighten the bend (visually at least)
Bo
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