Take it to the shop and they will chase out the threads and everything will screw in like a brand new-un. That or they will tell you that the threads are in fact dead, but I really doubt that.
In high school I knew a kid whose given, legal name was Michael Hunt, no joke. We would be at awards ceremonies for stuff, and they'd be drilling through the top 25, with each person getting a polite clap for coming in 18th or whatever, and then all of a sudden, "In 17th place, Mike Hunt," followed by like half a beat of recognition and then thunderous applause from the assebled high school masses. It never failed...