Years back there was an article on that but I can't find it.

Basically: you peel back the skin using a sharp pointed tool to help. The woven skin stretches and unwinds a bit. You do this to both ends. You cut cut back the rubber core on one end and push the exposed core on the other end in the skin of the opposing side. Or wrap the skin over the other core end (which ever works best). I guess then you can saturate the skin with glue, epoxy or anything and cover the joint with shrink wrap tube.