I was taking apart the wheel on my 78k and had some trouble disassembling the axle. Its apart but the two flat spots where the wrench fits is now rounded off. I don't know if I should try to touch it up with a hand file or get another one. However I noticed this axle is different than the one on my 73k. The one on the 73 has a hole for a screw driver to fit in and use a handle as you use a wrech on the other side. I like that design better and if I need to replace mine I would rather get one of these.
Does anyone know if the axle with a hole will fit a 78k? Is one better than the other?