I would call this a sister thread to the Megatron fix posted a while back, but I'm actually ashamed that it took me so long to figure out what was wrong with the Optimus Prime figure from the classics 2pack. The upper torso of the figure is meant to rotate and "super punch" when you push in the button on his back. It works more like the rotors on any of the helicopter figures of days gone by. Bush the button in once, hear the gears click and grind, and Prime's top half spins like a top. What this leaves you with is a Prime who's chest spins around like a boobie tassle. So how do you fix it? Well, pay close attention. Step 1: Grab the little black switch on his back. Pinch it, if you like. Step 2: Pull it out until you hear it click. The end. Seriously. Prime's bossom is now locked firmly in place. Between figuring that out, and the Megatorn foot fix, I'm extremely happy with this box set. They aren't as nice as their larger counterparts, but you really can't complain for twenty bucks. They're tons o' fun. Ten thumbs up.