I was watching this video on Youtube and i can't figure it out! This guy is cutting out this black stuff, that looks like plastic, then he puts it on this record looking thing and when he turns it, it makes an animatronic move. i don't know how to put the video on here, but it was on the making of the haunted mansion. if anyone could tell me what that is it would make me feel better, and probably give me an idea how to make my animatronics.