I have a sulky that i got off of ebay that has been working pretty well. Only problem is that crappy two piece wheels that are on it, like many of the wheels used on hand trucks. The sulky has a 5/8" axle on it. Does anyone know of a good replacement? What about the wheels used on "Jungle Wheels" where are they getting those? making them themselves? What size axle do "Jungle Wheels" have on them? Any ideas would be much appreciated. Thanks.