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Do you know what happens to shaft stiffness when we trim a golf shaft? Tip trimming or butt trimming can change the shaft stiffness of your golf clubs. We look at how shaft stiffness changes when you tip trim or butt cut. We also look at measuring stiffness using a frequency meter, deflection board, and using bend profiles or EI curves. Also learn to read a bend profile chart. Finally we discuss which of these methods works best.