I went out for a ride today and on the way home the speedo needle started waving around randomly, only slightly to begin with but by the time I got back it was thrashing about all over the place. When I checked it, the cable had been rubbing on the disc and had worn through to expose a tiny patch of wire that was shorting out on the disc, so I've rerouted it and I'm going to have to sort it properly tomorrow. I'll wrap some insulating tape round it for the time being but has anyone got any ideas for a more permanent repair without replacing the cable?