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Message: <blockquote data-quote="Pappy" data-source="post: 499884" data-attributes="member: 3278">Every trolling motor I know of has or at least recommends you add over current protection. Usually in the form of a circuit breaker. Most circuit breakers are not designed to break quick enough to protect the prop from damage. Your idea of a brass shear pin will hopefully accomplish what you want it to do but......the manufacturer may have designed the blades to go first and  protect the motor. Brass will shear before SS will. Your idea of the castle nut and cotter pin can be done pretty easily by the way. Drill your hole in the propshaft and then make sure to chamfer the hole at both sides to reduce shear load due to the sharp edges. Good thinking on your part! </blockquote>