Has anyone had problems with the axle hexes stripping out or slipping? I cracked the hub of one of my axial wheels[:@]and am not to happy. I had to glue the hexes into the wheel to keep them from slipping. My AX-10 has not started to slip yet but the wheels have a little slop already. I always make sure to tighten down the wheel nut really good too. Argh!![:@][:@][:@]