I can confirm the problems with the NAP Quiktune 4000 developing a cable slide "chatter" problem. My started doing this the same day it was installed. During the draw, the slide will start skipping, causing the arrows to bounce completely off the rest and clatter. The cable is sliding smoothly, but as best I can tell the Winner's Choice strings I use seem to have a more rope-like twist than others and these moving through the cheap slider's grooves are causing it to jump. My teflon slide is going back on, which I don't think is wide enough to be drilled and tapped to serve as a replacment. If the thing can't be tied off to a cable, NAP is getting it back. Not the kind of quality I expect from them. Like I say, it may be just my combination, but they should field test their stuff better than that.