Everything has to be removed from the output shaft, including the planetary assembly. Greg removed the snap ring holding the planetary assembly in place, and needle bearings were suddenly cascading everywhere. Sure enough, the instructions read: "At this point you will probably drop the needle bearings out of the center of the planetary assembly." We laughed, but we were also impressed with how good the instructions really were. It took a few minutes to pick up all the errant needle bearings. Per the instructions, a layer of grease was used to hold the needle bearings in place during re-assembly.