Watch Mainspring Winding Replacement Winder Barrels Tool Set Movement Parts. Mainspring Winding Winder Accessory Watch Tool for 3135 2836 8200 Movement (Red Base). Aluminum alloy material manufacturing ensuring maximum durability. Including a total of 14 models watch mainspring winder to meet your needs. It is an important tool for watch manufacturers and watch repair shops. A practical tool for watch maintenance personnel, jewelers or amateurs. Ergonomic handle is non-slip, easy to grip and convenient to use. Item Type: Watch Mainspring Winder. Model Number: C0711 / 8500-1 / 8500-2 / 3135 / 2235 / 7750 / 2892 / 8200 / 2671 / 2000 / 7120 / 2750 / 2836 / 2824 There are 14 models, among which 3135 and 2824 and 2892 and 2836 are the same size. Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.