I find that most Spirit props have no gears inside per se but what they will have is a sort of bent shaft coming from the motor to a plate (kind of like a cam assembly) As the crank (or bent shaft) comes around, it moves the plate up, down or around (depending on the setup). I had a problem with my Spirit (Gemmy) Witch head not moving and i opened her up and found that the shaft had moved out of the plate assembly so that it completely disconnected. It was a pretty easy deal to fix, all i had to do was to bend the shaft back to fit into the plate and it began to work as it should. If you are hearing a clicking etc. i would carefully open it up and examine the movement and determine what you need to do to set it right. After watching it run for a while, it should become pretty apparent what's wrong, after all, these are fairly simple clockwork type mechanisms without gears......best of luck to you.....'Scruff