41C4220A Sears Craftsman Gear Kit Shaft Sprocket Replacement fits 41A2817

41C4220A Spindle shaft with drive sprocket (grease not included) For 1/2 hp and 1/3 hp Chain Drive Liftmaster Chamberlain Sears Craftsman garage door openers Works with 41A2817 replacement kit For maximum performance the entire door assembly must be properly balanced adjusted and lubricated for smooth operation. Door should open manually with reasonable effort. Lubriplate Areo low temp lubricant must be applied or the gear will shred.