Technically, a Willie Hoppe Titlist has no pin as a Titlist is a one piece cue. It was the Willie Hoppe Professional cue, which was the higher-end, two piece cue of the same type as the Titlist, which had the 5/16-14 brass pin described above. Just thought I'd clear that up...
That question is kind of like "how many fingers am I holding up?" Where the real answer is 4 fingers and a thumb.