When the SureFit adapter was introduced in the 910 driver, I was told that shafts were tipped 1/2" to play true to flex, presumably because they don't end up as deep in the head as a glued driver so the tipping makes up for the BBGM.
However, I'm now hearing that only some shafts in the 917 drivers (maybe 915 and 913 too) are tipped 1/2" by default, and the 1/2" tipping in the 910 was actually to make them play the same flex as previous bore-thru drivers. However, that doesn't make sense because the 909 were blind bore and the SureFit adapter definitely results in a different BBGM.
Can anyone confirm which story is true?