I had an extensive conversation with titleist and was told their tipping has nothing to do with the surefit adaptor but has to do with wanting their 910 and now 913 line to play like their previous full bore through driver lines. If you check the 913's, the diamana shafts in the driver are not tipped at all while the phenom and bassarra are tipped 0.5 inch. I do know that all aftermarket driver shafts are normally tipped 0.5 inches but again, it's just a matter of them wanting the line to play stiffer like their older lines with the full bore through head