Originally Posted by Teamanglerx
Also, how would having the incorrect flex effect ball flight, especially with irons.
If Your Flex Is Too Stiff
1. The ball will probably fly lower and shorter for any given loft, compared to a properly fit shaft.
2. The ball may tend to go to the right, or fade side, for right-handed golfers because with a too-stiff shaft the clubface is harder to square (the clubface is more likely to be open at impact).
If Your Flex Isn't Stiff Enough
1. The ball might fly higher for any given loft, compared to a properly fit shaft.
2. The ball may tend to go left, or to the draw side, for a right-handed golfer (because with a too-flexible shaft, the clubhead may tend to come into the ball closed).