Hold the barrel end of the cable with a vice grip, take small hot torch and heat the cable right before the barrel, slide the barrel off, or just cut it off. After that you can slide the entire cable out of the sheath, shorten the sheath on the carb side while leaving that barrel intact on the cable. Once the sheath is the right length you'll have to slide the cable back through it then put on one of your fancy ends at the grip side in the right location. It sounds more complicated than it is lol.