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This incredible Snake Fast Guitar Winder is the best tool for string changing we have seen. On the edge is a bridge pin puller for acoustics. There are 2 models designed for almost any tuner key and you can customize the fit on any button (green unit) by trimming the special nylon inserts. The Purple one has a smaller head to fit best on 6 on a side, 12 strings, and smaller gibson and fender machine heads. The larger Green is recommended for 3X3 style tuners with bigger buttons like grovers, grover imperials, tulip style gibson etc. Each complete revolution of the Snake robo tool turns the tuner key 3 times. So just a few turns and you are almost up to pitch. Get yours today. 1 YEAR REPLACEMENT WARRANTY. http://www.robokey.com/?page_id=76