Joined: Feb 2012
Posts: 19,373
Likes: 5,516
From: Rochester, NY
Bikes: Stewart S&S coupled sport tourer, Stewart Sunday light, Stewart Commuting, Stewart Touring, Co Motion Tandem, Stewart 3-Spd, Stewart Track, Fuji Finest, Mongoose Tomac ATB, GT Bravado ATB, JCP Folder, Stewart 650B ATB
I can understand how a der mounting bolt might get cross threaded, unlike some here. But I do agree that it's a sad case just the same. As FB mentions try running it (or a 10x1 bolt) in from behind to have the chance to reform the starting threads.
If you are not comfy doing this go to your LBS.
It would be nice to have more info. Like is the hanger replaceable? Is it AL?
As to the trick to get the der in straight- It's about taking care to visually align the bolt and hanger then only turning the bolt with enough force to feel the threads just grab and also have no "friction" indicating they're crossed. Another words it's about skill and touch. Using a screwdriver like hex wrench helps to get the visual alignment right, a "Y" or "L" wrench are hard to align as easily (and a multy tool sucks). Andy.