Ive set the slipper clutch. i tightened it (clockwise) until it couldn't be tightened anymore and then loosened it (anti-clockwise) by half a turn. i put all four wheels on the floor and put my foot in-front of the car. i spun the spur gear and its slipping and then a little click. i took it out for a spin today and its reving really high at only half throttle. Ive lost about 70% power. i noticed that the front of the wheel hex nut is blunt on the front right hand side but the rim still sits on it fine without spinning. Help will be much appreciated