Originally Posted by BCRider

You should order a new one but unless the bend was severe it won't fall off from regular use unless you bend it in another fall.

There's a hint you can do that will reduce the effect of the bending back. Take the hanger off (most aluminium hangers are screwed on). What you're going to do is heat it with a propane torch to relieve the stresses of the initial bend.

To act as a marker for the temperature carbon the hanger with a candle flame or the flame from a butane lighter. Hold the hanger in the yellow flame body so it deposits some carbon black on the alloy's surface.

Now hang the haner on some steel wire or similar and heat it with a propane torch set to a medium strength flame. Play the flame back and forth over the whole hanger and heat it evenly over about a minute until the carbon black heats up and burns away. You'll find that the blackening doesn't just dissapear from the flame. It'll slowly fade as the hanger metal heats up. When the black is all gone including the last shades of it then turn off the torch and let the hanger cool naturally.

Now you can quite safely bend it back without it cracking provided, as I said before, that it's not badly bent.

I've straightened a couple of bent motorcycle clutch levers this way and one that's on a bike I still have is still just fine. I'm still enough of a skeptic to not do this to a brake lever but the clutch levers still see a lot of use and they have had zero issues.