Guys:

This 'special' gear is none other than one of the gears from the Tamiya TechniCraft series gear boxes. Its also used to 'power' the tracks on the static Tiger and King tiger kits.
If you know someone thats got a static Tiger or KT and isn't going to use the gearbox, ask to swap for his gears.

For reference, the one used is the 72005: ( 17.50 MSRP, but check with the AAF PX)



[link=http://www.tamiyausa.com/product/item.php?product-id=72005]TechniCraft series gearbox # 72005[/link]

It'll give you about 4 gears for traverse units (about $3 a gear, plus leftovers) I cannibalised my static one or I'd offer you one of mine for postage.

(will look for the gearbox to see if I can 'rework' the removed clutched ones to 'lock' them for those who are not able to DIY)