When working on the deck reinforcement, I needed to remove the spring loaded deck mount lock pins on the front of the deck. I wish I had taken the camera, but raining so hard & felt it wise to leave it in the house. Moisture plays heck with it. Anyways, instead of roll pins or large cotter pins holding the spring/pin assemblies in place, someone had put in fence post staples, then bent the sharp ends together!
Here's a rep pic of a fence staple. ]
That's as bad as using a bolt on the top of a caster wheel!