I have a heavey duty one in my garage that I use to reshape metal all the time. I make L brackets out of metal twice as thick as the z key with it and a hammer (not ti. though.). If the bend is in the wrong place i can just put it in and tighten it dodwn and it comes out straight again. So I imagine you could straighten a key too. Just try it a little bit at a time, and maybe wrap it in cloth to keep from scractching.