The front axle nut takes a 24mm allen which can be obtained at Sears. In a pinch, I have used an inverted 13/16" spark plug socket ( the kind with a hex collar on the upper outside part) and I place an extension going through from the side normally used for the spark plug and use the hex part of the upper collar on the socket to act like an allen wrench and loosen the nut. If the socket is too loose, you can shim it with a couple of feeler guages in two or three places to achieve the right size. This is simply make shift but it works. I finally made a tool with 15/16" (0.937" - 24mm is actually 0.945") hexagon bar stock about 2 inches long that I place a 15/16" socket on to loosen the nut.