Locks down a rudder blade but lets it flip up if it hits the bottom or an obstacle. Holds the rope securely but releases it at once when the cleat is overloaded. Resets in seconds by pushing it back down. Cam is adjustable so the release tension can be set to suit the boat. Fits virtually all sailboat lifting tillers. Can also protect centre boards. On sunsails it releases the support ropes when wind load passes a preset limit, avoiding damage in sudden high winds.
