Lever of Stable Neutral Position 31 March 2017, 22:00 Sorry, your browser doesn't support embedded videos, but don't worry, you can download it and watch it with your favorite video player! This mechanism keeps green lever firmly at its neutral position when no force applied to it. « previous mechanism Movable Spring Feed-Duct next mechanism » Nut-Screw and Bar Mechanisms load comments Please enable JavaScript to view the comments.