The flexible rotation probe creates a pilot dependent node that follows the average motion of all the independent nodes. That means it adds no stiffness to the structure.nThe proper way to use it is to select all the nodes on an end face. nThe first time you tried it, you only picked a single node on a solid element, and a single node on a solid element has no rotational DOF so the angle output is always zero.nYou can pick several faces, but then you are averaging the rotation of all those faces and the faces that don't rotate much will pull down the average from the faces that rotate a lot.n