Question about the Zeo Red Battlezord's punching arms.
 

So something I started thinking about when messing around with the Zeo Red Battlezord toy once I finally got some batteries back into it is, how does it move the pistons without damaging any wires in the toy since the arms can freely rotate all the way back for combing with the Zeo Megazord.

Is there a gear system that works through shoulder connection or is it all in the arms with wires coming out from the chest? If anyone knows how this work I'd really appreciate you letting me know.