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Gap Testing Your Golf Clubs, more golf Q&A with Mark Crossfield PGA professional AskGolfGuru with golf coach Steve Buzza. The guys are talking gap testing and how they make sure they know how far they hit the golf ball for closer iron shots. Mark Crossfield’s AskGolfGuru golf app for iPhone, iPad and android devices is a great way to get your golfing questions answered and for you to start playing some better golf.