When you say " sprocket" I think you are referring to the change gears. These are the fine tooth gears with the 4 spline center hole. This is common with new owners who travel the power feed beyond its limits. We have done this a number of times. Usually the small 27 tooth gear gives up, but also will break it's mate as well. Carefully dis-assemble the gear train completely- making notes or a drawing of how it all goes back together- then clean all the gears and inspect them. You dont want to have a piece of tooth stuck in one when you start it back up. Also check the shafts that the gears ride on for straightness- sometimes the force of the jam can spread the gears and bend the shafts. JT keeps these gears in stock and you can order just the ones you need. Also, when doing the gear setup, have a small amount of backlash between the gears- too tight will grind them up, too loose will break the teeth.