Above: View of the pinion gear on the differential side.
Far left (above): Blank castings received back from the foundry and ready for machining.
Far left (below): The castings after being machined and placed on the engine.
Below: The mating gear rode on the pinion on the back end.
Left: The finished pinion placed on the differential side of the engine.
Left: Three parts of the crank pinion; three parts are needed to make this pinion due to the flanges on either side of the gear. Below: A gear pattern made out of foam (left) and one out of wood (right).