Cut a metal coat hanger so that you can straighten it. You'll need two metal coat hangers. (each one will make one rod) Make each rod about 20 inches or so. On one end, bend about 4inches or so of each rod down at a 90 degree angle to make yourself a handle. My first test was to walk over a known water pipe in my yard. It worked the very first time. I still don't understand how it can work. To use yours, hold one in each hand with the length of the rod extending straight in front of you, using a delicate touch. Hold them very lightly, don't put any pressure on them. The rod should easly be able to swing back and forth. Now, slowly walk toward and overtop a known water line. If your holding the rods properly, they will slowly criss cross overtop each other as you approach. Keep doing this until you have found the proper hand holding technique. This will ensure yourself when you go out on your own to witch. I learned to make these from my father. It's alot of fun.