I need to find how to pull new wire thru an existing conduit. With the power on I am not showing any power to one of my outside lights and the other light has only enough to flicker. I would like to pull new wire to both lights. the closest is about 3 feet with 2 turns the other about 5' with 2 turns. Do I need a special tool or do I just attach the old to the new and pull? Thanks in advance.