To do this job quick and easy you need an air compressor, air nozzle, masking tape, and string. Fire up the air compressor and set the regulator to about 10 PSI, you don't want a lot of air pressure. Tape up all openings except where the cable starts in the frame and exits. Start the string in the cable hole and hold the air nozzle so air will push the string into the frame. Feed the string into the frame while still blowing air. The end of the string will magically exit the other hole! Now tie your cable to the string and pull the cable through.