tom@daumtooling: I tend to use glass-on fins because I can change the fin size,toe, cant and position quickly and with no damage to the core. However, the speed of sanding, variety of fins, and travelling ease are features I hate to lose. Given most of the changes I make are mainly in size, toe, and cant,it seems to me that a ball joint in a track would be great. My experiments, however, have been less than successful. Given you have done much work in the area of fins, I am assuming you have probably looked into this. Is it viable?