I would just say that this product was defective. What, you ask, can go wrong with such simple hardware? screws, that's what. It took very little torque to break the screw heads. The first broke very quickly with my trusty striking tool (and matching pilot holes). So I tried another one with a regular screwdriver. Apparently substandard steel was used on these propellers. Get normal screws from the hardware store, then no problem, but what agony.
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