Mark - see part number 1500 in the pic below. This is a gear that is free floating between 2 jeweled plates and slides back and forth when the micro rotor changes rotation. The gear at the base of the micro rotor drives 1480 or 1481 which turns the wig-wag which winds the movement through a few more gears. Craig

: The groove in the plate of 1481 looks wider and deeper in the
: diagram but otherwise they look the same to me too. But what the
: diagram doesn't show, and what I now want to know, is what a
: wig-wag pinion looks like!!