Reference: Rear gear box, rear side.

Rear side of rear gear box. Steel roll pin is 3/16" diameter by 1-1/2" long. This is where the crank handle connects. The zinc washer is 2" diameter with a 3/4" hole and is a tad thicker than the original one (I couldn't find a thin one). The grommet between the washer and case is 1-5/8" outside diameter (OD) and 1/4" thick so it's just slightly thinner than the original one.