So I'm sitting here at work, looking at the manual for a TT01D, looking at the rear differential gear assembly picture...

I see a larger gear that has a little "star shaft" with three smaller bevel gears connected to it that sits on top of it. Is that where you turn a gear backwards? Or where you jam something in to lock it up? Or is that somewhere different. And if that's really where you turn a gear backwards, is it one of the small ones?

Sorry for the extra Q's here, just a little confused.