I tried to adjust the chain slack the other day and the rear wheel axle nut would not break loose. I have adjusted the chain many times and was sure that to loosen the nut it must be turned counter clockwise, but then I 2nd guessed myself and tried to loosen it by turning clockwise. Neither way would move at all. I tried loosening it with so much force that the aluminum stops on the other side started bending. Any help please!?!