Just finished reading Jay Kidwell's book AGAIN and decided to make a PVC dry fire bow to work on form with additional reps in between actual shooting. Used a 66" piece of 3/4" PVC and parachute cord with about 10" BH to prevent forearm contact and tied on four pieces of rubber tubing to reduce the awful twang. It feels to be about 20# at 26". Anyone use or have used one? If so, what was your regiment like and your results?