Like others have said, it's not meant to come apart. That being said, it went together, so there is likely a way to get it apart. Unless it was press fitted.
In our reality with our orbits, your thinking centuries minimum and millennia easily. It looks like 3.8 centimeters a year, if this website is close to accurate.
Are you saying the restaurant should charge more and prevent tipping or if you don't tip you get hit with an extra charge? Or is it a different method?
Like others have said, it's not meant to come apart. That being said, it went together, so there is likely a way to get it apart. Unless it was press fitted.