Home Golf Tips For Driving DRIVER SHAFT FLEX TEST – DOES FLEX MATTER? REGULAR v STIFF v EXTRA STIFF DRIVER SHAFT FLEX TEST – DOES FLEX MATTER? REGULAR v STIFF v EXTRA STIFF Golf Pro May 03, 2019 comments off Tweet on Twitter Share on Facebook Pinterest DRIVER SHAFT FLEX TEST – DOES FLEX MATTER? REGULAR v STIFF v EXTRA STIFF See also 3 Tips To Drive Straight