Rickochet Besides being a pioneer in the long and light driver concept he was involved in the development of the various Neufinder (NF) spine finders.
I helped Dan Neubecker with Bernie, Dave Tutleman and Tim Hewiit develop the NF4 with the kg calibration. Tim Hewitt maintained a deflection profiling site for a few years then took it down.
Here's an old thread on the NF4. https://golfbuzz.com/d/6748-request-for-your-help-neufinder-nf4-nf4-1-build-calibration/19