Also see my thread farther down the page ("Replacing an N-frame Sight Slide"). I just ordered a replacement kit (sight slide/blade, spring, screw, pin, instructions) from MidwayUSA for $11.49 + s&h, delivered in 3 days. If you already have a replacement blade, you can just order the screw kit, because you have to break the screw to make the repair. If you need a blade, you need to mic/measure your broken blade height (if possible) in order to get the proper replacement blade kit (.126, .160, etc), and you can order blued or white outline. Good luck.