Disregard- good old Mercury 4 vise. Straightened the hanger out faster than green grass through a goose.
If you bent it cold, expect it to be very fatigued, and likely to bend again. If you use heat, you can bend it more easily, BUT, let it cool normally to avoid making it brittle.
While you have it out, chuck it up in a drill, spin it, and clean it with steel wool/scotchbrite/emory or such to remove as much corrosion as you can. Then oil it before you shove it back thru the case. These get "stuck" often due to the stock bolt rusting and/or creating galvanic corrosion between the stock carbon bolt and the aluminum cases. They can be a PITA to remove and install.