Cut the modular cable to the desired length. Make certain that the end are cut squarely, not diagonally. Insert cable between stripper blades. Squeeze handles, cable must be keep perpendicular and then pull from the tool. Place modular plug with cable into the tool's holder. Make sure the stripped wire is between the tab and gold contacts. Squeeze handles until it stops. Remove the outer jacket, insert the stripped cable into the plug, make sure the left wire at one end matches the right wire at the other end. Squeeze Handles and Open The Lock.