The Dawson Kiln Sitter firing gauge is a small metal disk used to adjust the Kiln Sitter actuating rod to ensure a safe and accurate firing. Use the gauge to adjust the actuating rod after every 20 or so firings. Place the gauge on the cone supports, sliding the actuating rod through the hole in the gauge. If the actuating rod is not centered in the porcelain tube, loosen the two screws on the guide plate and move the guide plate from side to side. Lift the Kiln Sitter weight to the raised position. With the firing gauge in place, the trigger should just barely clear the release claw, coming as close as possible without touching. If the gap is wrong, loosen the set screw in the center of the weight, move the trigger and re-tighten the set screw.