Hi all. I'm not a big stoner, yet. But I have friend who is, and I just bought her a Monkey Pipe as a gift. The shop recommended I buy the screens too, but screens don't seem to fit over the opening. Are you supposed to take the pipe apart to fit the screen? I'm assuming one screen last through several uses, right? I'm sure my friend knows a lot more about this, but I want to make sure I got her the right size screens; 5/8" or .625". Thanks.