I believe you better check with your motor people, This happened to me several years ago, I believe it is also used for corrosion control also, or if I spell this right electolises. I do know if you put one on be prepared to get wet they are hard to adjust, you must get in the water with a allen wrench and keep adjusting untill it steers straight.



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. Like bob46 said, it is a sacrificial anode, and is used for cutting down corrosion from electrolysis. It also helps to offset prop torque, so that it won't be hard to steer certain directions. If it was there to begin with, in my opinion, it serves a purpose.
