After seeing your example, I would think it could be stretching from stress on the rotator part of the hinge assembly. Such a poorly designed pin and hinge arrangement would make for extreme stress on the rotator part of the hinge, every time it is opened or closed.
Much like the dreaded 'stretch' on the bracelet of a gold Rolex, from stress, I would think a redesigned hinge, or more drastically tapered pin, would have been the solution.
The damage to the head could be the result of poorly cleaned and lubricated dies. The head/beak is the smallest part and the head/beak would be the easiest to damage upon extraction from the die.
Bob Hritz
In the land of the blind, the one eyed man is king.
Duct tape can't fix stupid, but it can muffle the sound.
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