Build a Torsional Flex Tester

Is the torsional flex of your ski worth knowing?

Do you want to know what it is out of the box so you can check it later if you think something feels different?

Do we actually know for sure how a softer or stiffer torsional flex affects us and which one we like better?

Do we know what the torsional flex is of the skis we have liked and did not like?