Mainspring (Hammer spring) Winchester 1873, 1894, 1892, and model 53

hammer spring (mainspring) for 1873, 1892 and 1894 (pre 64) Winchester. This is the spring that puts tension on the hammer. These springs are CNC machined out of high-quality spring steel to original factory specs. The mainspring Screw wp47 us used on the 1892 and 1894, and model 53. wp621-a is the mainspring screw 1873 model.