The problem is that Zeus is a toddler. An eight year-old toddler. An eight year-old, 2000 pound toddler. He loves to knock the pin and spacers off onto the ground.
Emerging from the barn carrying the beam, I noticed Zeus chewing intently and smacking his tongue. I immediately scanned the ground and noticed the wooden spacer and, more importantly, the pin on the ground. Thinking I had that base covered, I set about feeling around in his mouth for a foreign object- no easy task with the chewing going on.
Two or three failed attempts later, I started to assume that he was in fact chewing his cud and things were fine. Then I noticed he was clearly working on an object.
Back into his mouth went my hand, only to return with a well-chewed leather spacer, looking for all the world like black beef jerky.
Either that or Zeus was acting as if he was a 'jerky" beef animal. You choose. Either way, keep your eyes on the toddlers and make sure they have a magnet in them. You never know what they'll pick up.