Not that up on Trek models, assuming it is a forged dropout- Campagnolo and Shimano both have made tools for this purpose. So does Park. Bending it back within one degree or so is not the issue, it is the final amount. The Shimano tool was developed for the first generation of SIS and uses a pretty fool proof way, the tried and true Campagnolo tool needs an experienced mechanic. I have seen the park tool but not used it. Bend it by eye most of the way, locate a trustworthy mechanic for the final finesse.