Re: rubber hub
All the way back to the early 1960s, Chrysler used rubber hubbed props on almost all their engines. Earlier, West Bend probably did also. The only exceptions I know of are the 3.6 and 4 hp engines which used strictly a shear pin drive. On the other engines, the hub was splined to take engine torque and a "shear" pin located the prop on the shaft. The pin was held in place by the tail cone. Even engines as large as the 120 used this arrangement. I never particularly cared for it. If the pin broke, the prop could ride back on the shaft and wear against the lower unit casting. After 1979. they changed the lower unit and then the prop was located on the shaft by a thrust washer.
