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I have no idea if Harvey Boysen's Merc 90 has a shear pin or if it has a rubber insert in the hub to protect the prop when it's stuck in an oyster reef. I am CERTAIN, however, that it does have prop protection.

This being said, I would and do use a stainless steel prop on any motor susceptible to getting hung up on anything, including oyster reefs. The Stainless Steel will suffer much less damage from these obstructions than an aluminum prop.

I have had many prop collisions with oyster reefs over the years redfishing in the shallow water cuts off the Intracoastal waterway around Freeport and Sargent, as a matter of fact, I almost always get into one that crosses the entry to one of my favorite cuts, and I have never had to replace a SS prop. I have had to have repairs done to one I had back in the 90's, but I actually sheared a pin and had to replace it that day to get back to the dock.