To address the Z Atty Pro comments: I've heard from several people about glued center posts on theirs. I had mine completely appart and my center post is threaded in not glued. Nor has my cap ever fallen off, and I walk around all day with it in my front shirt pocket. Possibly they have made upgrades to the Z and not made a huge noise about it? I don't know. Have people had problems... obviously yes. I just do know for a fact that the center post on mine is NOT glued. And it has been working flawlessly for 2 months now.