http://bennettbuilt.com/page10.htm

Nathan, Pat, and the others who have been responding to this thread, maybe I should have added that I would not attempt to adjust an engine without one of these. It really takes the worry out of being close! I would rather tune a gas engine than a glo engine, but I only had Fox's, enyas, and OS. the ones less than an inch from your knuckles. One other thing I can truthfully say, I have never cooked an engine from the carb being to lean.