Many thanks for your question! The sentence that you quoted refers to the fact that I use a modified version of the original idea that Lloyd Loar & Co. came up with at Gibson in 1924...the curved single-action truss rod. I'm a huge fan of that style of truss rod, but it takes a good bit of finagling to get it right. The fact that it is curved means that less torque is required for the rod to move the neck; and in addition, one has a bit of ability to locate the area of maximum "push" as well as some control over the nature of the "taper"...this all refers to where the rod exhibits the most force and how that force is distributed. This is controlled by the exact shape and depth of the truss rod channel. The nature of all of this has to work in a very symbiotic, planned way with certain other aspects of the neck, in order that "good internal stress" (planned) rules the day whilst "bad internal stress"(unplanned) remains negated. The shape/depth of the TCM truss rod channel would not be ideal for a straightforward trad neck design/build schedule.