I have a new XB-600 and am having trouble keeping the rear axle tightened. It seems to loosen up within a couple of days of riding. I am using a crescent wrench to tighten the double nuts on each side of the axle, and find it difficult to get a wrench on inside nut once it is tighened.
The other things that bothers me is that the lock nuts seem to be designed to keep the axle from spinning even if it gets loose, but using the flats on the axle, but that does not seem to work. If the axle nuts get loose at all, the axle starts to rotate backwards when going up a grade. It seems like that will break the wires going into the center of the axle eventually.
Has anyone else had this problem, and what's the best way to tighten the rear axle so it stays tight?