Driver Shaft Flex. Project X Black 6.0, Project X Black 6.5 and Project X Black 7.0
Looking at a progressive driver shaft flex test. Making the shaft stiffer and stiffer to see what the characteristics are.
This could be a good guide if you're looking at custom fitting with a driver and what your looking for if the driver shaft is too weak, too light ....something ideal and then what happens when the shaft is too stiff
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