HSI: Hardware Scene Investigation- Case of the Missing Pin

It was late evening at a roadside diner when Detective H.A. had an odd feeling.  He scoped around a bit, and then spotted it.  Following a trail of paper towel scraps, they brought him to this horrible sight -a hinge with a missing pin. A former shell of itself, all that remained of the hinge was just a half leaf left lifeless.  H.A. knew very well that without the proper pin retention, a pin can be pulled, pushed, or even dragged out of a hinge, but who could have let this happen?  Was it staked? Had there been a crimped end? Maybe signs of a spun end or two? He quickly referred to his notes on Pin Retention and found no evidence that anyone had taken steps to prevent this hinge tragedy.  If only they had viewed the Pin Retention Case Video, he thought, this situation could have been avoided.