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I have one other lingering question.  Someone mentioned that some knuckle pivot pins are made out of plastic.  I have never seen one.  From my observations on Saturday, I assume that these knuckle pivot pins bear considerable shear force when the coupler is under load.  I can imagine that the solid steel pins could bear such a load, but I would be suprised to learn that a plastic pin could provide the same shear strength as a steel pin.  So I would like to know more about the reason for using a plastic pin and what its strength is compared to the steel pins.  It would also be interesting to learn the exact composition of the plastic pin as well as its cost compared to a steel pin.
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