A heat dissipation device includes a base for being contacted with a heat-generating element mounted on a circuit board, two frames rotatably mounted to the base, and a thermal module secured to the base. Since correction of the shaft may be performed by grasping a separate shaft to be inserted to the through hole, the shaft is not scratched. The rail has respective plate-like widened sections at the sides which carry folded prolongations at diagonally opposite end edges which can engage around the guide rail like a clamp. Other embodiments include apparatuses, systems, devices, hardware, methods, and combinations for airfoils and turbomachinery. The second selecting unit selects the increase target terminal and the second calculating unit calculates the increase amount when the reduction target terminal is not selected by the first selecting unit.