The tricky stuff explained
First let's look at a scheme how the ClickStick button actually works:
And here are some more details on the switch and how it works. I know it might be hard to find exactly such a switch, so I prefer giving you as much info about it as I have, so you may find at least a similar one at your local electronics tinkerer shack. This is a scheme of the switch:
And there is also a scan (bad quality, since it's a scan and not a photograph)
of a disassembled switch:
