i just purchased a philippi titlist conversion cue at an apa regional tournament. it looks like a 5/16 14 pin but i tried to screw a 314 shaft onto it that i have for a joss but it wont screw on. i put the 2 pins next to each other and noticed the philippi threads are slightly thicker at the top of the thread, and the joss are pointed at the top. the 2 pins lay into each other perfectly so i know they are both 5/16 14 and all the protectors fit the other shafts/cues. are there different types of 5/16 14's?