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Golf Grip iPhone App Swing Lesson with Mark Crossfeild. Backswing With a Driver Golf Lesson iPhone App with Mark Crossfield. Watch the exeter golf professional talk about how the golf grip will affect your game in so many ways. Not only does it change your have angle into the golf ball but it also will change your swing path. Hitting tee shots, irons or any golf shots straight will become a huge ask if your golf grip is not correct.