Insert the stringing material into your crimp end or endcap. Depending on what type of endcap you're working with, be careful not to push the material through the other end. For endcaps, squeeze gently but firmly and hold for a minute. For crimp ends, slowly squeeze with your chain nose pliers so the metal crimps down on the stringing material. Be very careful not to squeeze too hard too fast. For best results use Nylon Jaw pliers (TOOL-105) to prevent marring the metal.