I love vintage fender and most open back tuners, they seem to hold tune better than sealed, plus you can flip the side on good ones. Bit ! $! $$, 25$ each for hipshots, us 6plus string players the cost is high. At first I had just wanted to make a few hipshot copies for my own use, then I came opon this.. it is a 20-1 worm gear, but the new profile supposed ly provides higher torque and greater stability. Hmmm. Off to the machine shop! Also anyone know a sourace for work gear sets?