My son is trying to take off his stock Bandit VXL Wheels/Tires, he got a set of Anacondas with Wheels. He does the usual nut removal, but it wont come off, we know he did not strip it, so we tried another side even more carefully, same thing it loosens up but the nut just starts spinning freely then will not come all the way off ??? Have never has this before, any ideas ?