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To clamp a piece in the JawHorse, slip the lock lever (arrow) to the upper, unlock position; place the piece in the jaws; and slide the jaws against the piece. Move the lever to the lock position and push down on the lever with your foot. More foot pressure exerts more clamp force, up to one ton maximum, so be careful. To unlock, merely flip the lever to unlock and step on the clamp lever to release the clamp load.