With all the shapers I know, most have found my tool to be most useful. Just taking a straight stick and taking measurements is not the same as copying the actual curve. Even if the measurements are close together, it’s not the same. My friends with shaping machines say that this method is far more accurate. I have had some with programs on the computer make a rocker template from a board the put it up against the machine cut and have it completely different. I have sold a few of these to the machine operators and their customers. I first saw these back in the 90’s when my friend Gary Linden brought one back from Japan. I saw them and created my own version. I have sold approximately 100 of these and my customers seem to like them.
Barry