I'm just returning to pool after playing as a teen. Last summer, I bought my first serious cue. I just read the "2 shafts" thread. Several people mentioned using their second shaft as a back-up in case their tip breaks on the one they play with regularly. That makes sense to me. My question is, "Is there a danger of having the tip dry out (or some other such thing) while not being used? Do unused tips last a long time, or do they have a shelf life? If I don't use my extra shaft for a year or two, will the tip still be any good if I go to play on it?