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cordon,Thanks for posting the photos.  Now I see your point about the force bearing ridges, and I think it is accurate.  Although, in your diagram, you callout two sets with one set close to the knuckle pin.  I don't see that set.  I thought you were referring to that first point that the knuckle steps down from its full height.  But I think your observations are correct for the ridges on the knuckle "tang" (my word).  Are these mating ridge features on the top and bottom?  I can clearly see them on the top.  The "C" shape I was referring to was meant to be in a schematic sense, not the actual shape.  I meant that the general structual shape of the knuckle when view from the top of the coupler is the shape of a "C".  I am still a bit confused as to how the knuckle pin remains unloaded during the tractive pull.  I can see that the locking pin does prevent the knuckle from pivoting, contrary to what I said in the earlier post.  I know that the locking pin is impossible to pull when the coupler is under load, so I must assume that the locking pin is loaded against rotation when the tractive effort is applied.  I think I am going to have to make a field trip.
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