I had to replace my rear wheel after a loose tensioner bent some of my spokes. I'm trying to install the sprocket onto my new wheel, but I keep getting confused on how to keep the coaster brake working and where the small metal piece comes into play (the squarish roundish one the goes over the axle, kinda shaped like this (_) .) The only tutorial i found was for a bike without a coaster brake, so could someone explain in detail or post some pictures on how this thing is assembled? Thanks