I had to take apart the entire back half of the bike to replace a part and now I can't remember how to put it back together. Classic. My camera's not working, so I've drawn a ridiculous drawing in Windows Paint to let you know what I'm talking about. It's for the pedal chain. In between the front and rear sprocket, there's two little ones. In regards to the little ones, I can't remember if the chain went over-under or under-over, or does it even matter?