Originally Posted by
Gonzo Bob
Loosen the allen bolt visible in the last picture. Slide the entire assembly inward on the handlebar (away from the rubber grip). Separate the "grip" part of the shifter from the body - you may need to twist it on way or the other - and this should give you access to the cable end. You may also find that that triangular shaped plastic piece is removable but maybe only if the grip piece is first removed.
I'll try this later tonight or tomorrow.. but the assembly in the picture is all one piece as far as I can tell. The "grip" part isn't a soft rubber, but a hard plastic.