I just did this myself yesterday. I used a large, flat head screw driver, i slide the screw driver through one of the holes between the sprocket and sprocket hub and then into one of the slots of the axle/bearing carrier(the do hicky). I just held it tight in the slot and turned the wheels. as the sprocket turned so did the carrier. This is hard to describe with words. its just easier to show but i don;t have that luxury on a forum.