Missing 3rd gear in machine room.

[angelsonfire]

This is going to seem weird, but I'm in the machine room, I've got the steam going, added the rods correctly, everything is great....BUT the third machine gear has disappeared. I've got two of them in place, and I've looked in the places where another gear is supposed to be over and over. I've searched everywhere. When I first took one down to the big machine, I accidentally threw it at the machine to the left of where the three gears go, and it disappeared. Yes, I'm a klutz. Is it possible that the gear showed up somewhere else then it's supposed to be? I swear I've searched every damn nook and cranny in the machine room! AAARRrrrrgh! Any suggestions would be greatly appreciated.

P.S. I've looked at numerous walk-throughs and checked and double checked.