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@benbrangwyn
If you don't have the right tools, take it to the LBS. It's very hard to straighten a gear hanger by eye (only pure-bred geniuses can do it - you know who you are).
The other thing is that the drop outs will almost certainly be out of alignment and you'd need a shop to do that for you anyway. It's a really quick job in the hands of a half decent mechanic and be the difference between fucked gear changing & imbalanced frame and sweet ride.
If you were crazy enough to try to straighten it yourself, you can use a standard 10mm wheel axle. Some people actually use a full wheel as the alignment tool, screwing in the end of the axle and then comparing this additional wheel to the wheel that's sitting properly in the frame, and adjusting accordingly.