Small head weight shifts swing weight and flight
The instructor notes that only about eight grams of head weight was the difference between an unbalanced driver (swing weight D1) and a balanced one (D5) — he stresses it is very player specific but the resulting numbers were dramatically better. He adds that it is not just how much weight but where you put it: here 18 grams went in the back and six up the front to raise the head's MOI and increase the stability of ball flight.
Channel: Club Champion
Watch official source at 9:20Why this context matters
During the fitting, after swapping to the player's normal head weight.