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Since the late 70's, this Kahler "after the nut" Pro stringlock has been adorning headstocks all over the world! And because it's such a simple device to install, it's no wonder why it's the most common type of locking device you see installed when there is a Kahler CAM system involved. Did you want the Deluxe stringlock with the 3 finger levers that you press to tighten? FYI: Kahler fulcrum systems like the Traditional, Spyder, Killer and Steeler used the Kahler SD lock nut.