You should only repair cable when you're in dire straits, as it's better to replace broken cable as soon as possible. All you need is this $5 repair kit compiled of parts from a local hardware store: six appropriately sized cable clamps and two cable thimbles. For a cable end repair, simply loop the cable back on itself, install the thimble, and attach three cable clamps. Always put the U-bolt side on the hanging end of the cable; this is the "dead" end. You put the saddle part of the clamp on the end of the loop that runs to the winch, the "live" end. To remember, recite "never saddle a dead horse."