You're right, they do press together. However, I've also seen that they come apart. Unfortunately, I didn't see how and the person that did it is now a continent away and I have no way to get in touch. So, I'm hoping someone on CF knows the trick!
Observations are gold; hypotheses, silver; and conclusions, bronze.
Democracy is two wolves and a lamb voting on what to have for lunch. Liberty is a well-armed lamb contesting the vote.--Ben Franklin
Everyone is entitled to their own opinion, but not their own facts.--Daniel Patrick Moynihan