I AM THINKING ABOUT GETTING THE NEW 818 H2 HYBRID. CURRENTLY I AM USING THE 816 H2 HYBRID. I REALLY LIKE THE SHAFT I HAVE NOW AND WOULD LIKE TO USE IT ON THE NEW 818 H2 HYBRID. AFTER LOOKING ONLINE I CANNOT FIND ANYTHING THAT SAYS SHAFTS CAN INTERCHANGE FROM THE 816 H2 TO THE 818 H2. CAN ANYONE TELL ME IF THE SHAFTS ARE INTERCHANGEABLE BETWEEN THESE 2 CLUBS. ANY INFORMATION AND FEEDBACK WOULD BE APPRECIATED!