Originally Posted by
rpenmanparker
Tool purchase: Park rear derailleur hanger straightener. What was I thinking? I have never had a bent hanger in nearly 35 years of high-end road bike riding. If I ever do get one, I will go to the LBS with it. I will never use this tool.
My LBS guy just sticks a 5mm t handle in the bolt and tweaks it how it needs to be. His 30 years experienced eye tells him where it needs to be.