Here's the deal: Someone payed me to tune up their bike, so I took the derailleur off to straighten the hanger. The first few threads were stripped out, so I accidentally cross-threaded the tool and messed up the hanger. I don't want to buy a new one, as I'm leaving in a few hours to go backpacking and I don't have time to drive 45 min. to the Trek shop. What are my other options? I've heard of helicoils, but what are they? How long does it take? Thanks guys!