Murray 761789MA Craftsman 761789 583010 Snowblower Jackshaft with 36t 7t SprocketsThis is a very hard to find compound sprocket/jackshaft used on a Craftsman or other Murray product snowblower. When you do find one, 9 times out of 10, the 7 tooth pinion has significant wear. This one is in really nice condition. I have.