FIrst, Get a tube, it doesn't matter what material, and get some wire. Take some black wire tape, and tape an end of the wire onto one of the ends of the tube. Start wrapping the wire around the tube, and keep the wire close together and very tightly wound. Once you get to the other end, start wrapping the other way, and stop about two-thirds down the tube. Move down the tube about one third of the way down the tube and wrap the wire until the end of the tube. Now cut the end of the wire, leaving about 5 inches of wire off the tube-coil. Now tape the end of the coil, so it doesn't go loose. Make sure your finished result looks like the picture below.