If It's a predator cue then I believe It is uniloc, unless they have a new one now, and You can buy the inserts for those. If It's a different make handle It could be a different pin though. The tap they sell is actually 7/16-20 , but that is only for installing the inserts and only fits the OD of the insert. If that doesn't help then maybe this thread will be of interest. http://forums.azbilliards.com/showthread.php?t=67705