In his book Ralph Maltby explain how to exposure the flexpoint, bend point or kick point of a shaft. But he did not explain how to tell if the point  is low or high. I have made a system which the shaft is clamped and pressured from both ends until it bends, the system also measure the amount of pressure sufficient to bend the shaft in grams. I hope to see the shafts resistence to bend and axial stiffnes.