For 41C4220A Chamberlain Craftsman LiftMaster Garage Door Opener Gear Kit
Garage Door Gear and Sprocket Kit Replacement for Liftmaster 41c4220a fits Chamberlain, Sears, Craftsman 1/3 and 1/2 HP Chain Drive Models Fits Chamberlain, Sears, Craftsman 1/3 and 1/2 HP Chain Drive Models 41C4220A & 41A2817 Gear & Sprocket Assembly Replacement Step-by-step instructions included, free tech support available (see video)