Sorry we got off track on ya Dave. I forgot to mention two things that I thought of when I read the original post. I wonder if the wheel in your pic is where Horton got the idea from for there dial-a-range set up. Never really cared for it but could be where they got it from. I also had a friend of mine that used to swear by the game tracker strings, said they where the best thing he ever used. Then one time he took a shot at a doe and his arrow jerked off target and he missed the doe. Some how the spool "bird nested" on him and he never used them again. They are a great idea but a bad spool made on Friday could cost you a deer!