Abstract: A rotary mower includes a rotary cutting disk, at least one knife, at least one knife pin, and a spring plate. The rotary cutting disk has at least one knife mount location. Each knife has an end with an opening therein. Each knife opening has a double keyhole shape with a larger center hole and two smaller partial holes respectively on generally opposite sides of the center hole. Each knife pin extends through a corresponding knife opening and is mounted to the rotary cutting disk at a corresponding knife mount location. Each knife pin has a distal keeper with a double keyhole shape which generally approximates and is slightly smaller than the double keyhole shaped opening in each knife. A spring plate is positioned under the cutting disk adjacent to each distal keeper of each knife pin.

Abstract: A rotary mowing implement including a rotary cutter bar disk, at least one hub, a blade element, a pin, and a pin retaining mechanism. The at least one hub is connected to the rotary cutter bar disk. The blade element has a hole therein. The pin couples the blade element to the hub. The pin is insertable through the hole and is removably coupled to the hub. The pin retaining mechanism couples the pin to the hub.

Abstract: A rotary mowing implement including a rotary cutter bar disk, at least one hub, a blade element, a pin, and a pin retaining mechanism. The at least one hub is connected to the rotary cutter bar disk. The blade element has a hole therein. The pin couples the blade element to the hub. The pin is insertable through the hole and is removably coupled to the hub. The pin retaining mechanism couples the pin to the hub.