Mercury - Quicksilver 8150264 Cotter Pin Stainless Steel Propeller Retention 8150264. Overview. It's the kind of part you don't think about - until you lose it. The Quicksilver 8150264 Cotter Pin might be small, but it does an important job: keeping your propeller locked in place so every bit of power goes to the water, not to wasted motion.. Made from marine-grade stainless steel, this pin stands up to torque, vibration, and saltwater without bending or rusting. It's simple, strong, and built e