I am rebuilding a 76 XT500 basket case (never had one before, none in the area). I am installing new cables and I can't figure out how to attach the speedo cable to the hub. Cable slides into the hub nicely, but there's no place to put a screw to hold it in. Also, cable has a slot that looks like it might require an o-ring or a seal but none came with the cable. Clymer and Haynes manuals no help. Can anyone out there clear this up? Thanks!!!