you have to measure the thickness of the pin and the number of threads per inch. if you give us a picture and the maker name we can may be able to narrow it down
If your cue is a Wes Hunter...its a unique pin of Wes's design. He cut a few threads off the top making it a bit quicker threading....a very nice pin indeed. If I recall correctly its a custom 3/8-8. Eric Crisp of SugarTree would know exactly. Basically....if you have a big pin that threads into the shafts wood threads with no brass insert....its a good pin.:thumbup: