You can do probably do it with an arbor press!! It doesn't take much pressure but the pressure has to be applied in the right area and you have to bend pretty far past straight to get them straight again.
They almost always bend just below the lower clamps.
You need a press, 3 V blocks, a magnetic base with a dial indicator, sharpie and some patience 
It's on the 1st few pages of my "20 day 200X build"
Maybe I should write something up (with pics too) and have the guys move it to the world class help forum...........??
All our government does is distract us while they steal from us, misspend our tax $ and ruin our country