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Message: <blockquote data-quote="Still Afloat" data-source="post: 499885" data-attributes="member: 32426">I agree that it’s drive pin rather than a shear pin.  Even brass is likely too strong to save the prop.  You may want to try cutting the head a nylon bolt for use as a shear pin.  I’m not sure how well it will hold up but, you need a material that’s softer than the plastic prop if it’s expected to function as a shear pin. Back when I was into RC planes nylon bolts were commonLH used where decent shear strength was needed during flight but, you still wanted the bolts to break in the event of a minor crash or hard landing.   A commonly use was to fasten the wings and landing gear.  I never had an in air failure despite some high G maneuvers.</blockquote>