ORIGINAL: Phoenixangel
If the threads on the crankshaft are bad, you should exchange the entire aircraft for a new one where you bought it, if it was a larger chain most of them like hobbytown usa will just exchange for you..
If you are unable to do this you should absolutely contact hanger 9 or evolution, no reason you should pay for something new that is incorrect out of the box.
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I know this is a hard advice for you to follow, being so eager to fly your dream model, but it is an excellent advice.
Try to have some experienced RC pilot take a look at the shaft and determine what the problem is, so you can make a valid and exact claim.
May be returning only the engine will be acceptable.
Best of luck!