I have a R9 Supertri Driver (460CC) and a R9 Driver (420CC). The Supertri driver has a Regular Flex factory installed shaft and the R9 Driver has a Stiff Flex factory installed shaft. My question is whether it is OK to swap these shafts ? Will these causes any damage to either driver ? I have tried this and see that I can easily do this. But I have not tried to hit either driver with the shaft swapped as I am not sure whether I will cause damage to either driver.
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