I gather that "witness points" are bends in the string at the tuning post, nut, and saddle, but as far as I have even known, they occur whenever you add new strings without doing anything special. Seems to me the witness points establish themselves in the course of stringing up your instrument, is that right? Or do you have to consciously bend/stretch the strings at those points? Personally, I've never heard of a witness point except here on these forums, and I've been playing for almost 30 years. That doesn't mean, of course, that they don't exist; it probably means there's a gap in my knowledge.