Not talking custom club makers. This one is about oem companies. What would you think swing weight tolerances would or should be. Cobra for instance shows graphite shafted KFTs are standard c9 steel shafted d2. Another company stated that a club would be d2 in an email. Clubs show up between D 3.5 and 5. When I contacted them they said that those numbers are within tolerances. They did however offer a return and to rebuild clubs with another shaft. Maybe I’m wrong but I would hope that tolerances would be tighter than that.