Originally Posted by Andrew R Stewart

I prefer using pry tools and not impact ones. The rotor is thin enough so it will easily bend and impacts are rather challenging to control. The industry offers various "disk truing tools" that are just a strip/bar of, usually, steel with a thin slot cut in it. The slot will slide over the rotor and grip it so the bar/lever can manipulate the rotor back and forth. 6 or 8" adjustable wrenches do much the same. You can place the wrench(s) over the rotor's outer edge or onto one of the "spider arms" extending from the hub. When doing this for the first time go slow and learn how much tool movement equates with how much rotor change. Do clean the wrench jaws as rotors and pads dislike contaminates, like oils. Thus never spray lube your chain if you have a rear disk brake. Andy