I tried supertux's method and it was just as easy as adjusting a clutch's freeplay on a manual bike.
2 minutes should be plenty of time.
Except for the rubber dust cover. I tried sliding back on up the cable when I'd adjusted it and the tip folded in on itself about a 1/2 inch. Now it won't cover the threads like it's supposed to.
Any idea on what tool to use to stick in there to get the tip back out, so it slides over the exposed area?