Those Uni-Loc pins can be a pain to remove. Since the Uni-Loc design is piloted, you also need to plug parts of the hole to get a nice flatfaced joint. I cant say a joint pin change will diminish how the cue plays, but depending on the pin used, it might change the balancepoint. I'm nota huge fan of Uni-Loc myself, but I wonder why your contemplating the pin change? If you have lots of shafts in 3/8-10 or whatever you want the pin changed to, fine. If it's just an idea you have, maybe it's not worth the cost and potential problems, as Joey allready has alluded to...