Some possibilities, which I haven't tried:
- try to bend it back into shape with my hands while still mounted
- take off the rotor, sandwich it between a couple of wooden blocks, put some weight on it and leave it for a night
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Try a Park DT-2 rotor tool or something similar.I've used a large adjustable wrench with mixed results.Usually the larger the clearance between the pads and rotor the more forgiveing it will be to the rotor being a little off.I leave the wheel mounted,spin it to find the high spot .Then tighten the wrench on to the rotor and flex gently to straighten the rotor.