An axle stall involves getting both trucks onto the coping, and then turning back into the ramp. To axle stall, you must go up the ramp with some speed, and to start off just do a quick turn so you back truck hits the coping. Once you can do that it is time to do it properly. Drop in the ramp and go up the other side, do a kikturn quickly but lean back while doing it so that you end up standing on your board on top of the coping. If you have done this right you wont be moving at all. To drop back in, move your back truck forward until you feel it against the coping. Start to lean into the ramp, then quickly lift your board and turn back into the ramp.