How do the buttons with two positions work (like a clicky ballpoint pen)?

I was wondering if anyone had a link to or name of the mechanism allowing a button to have two positions. So when you first push it it goes down, and when you push it again it goes up. Kind of like on the top of a pen. But on a pen when you push it down, the button is still loose (like you can freely move it and if you turn the pen upside down the pen top falls into the top position). I can't have this looseness in the button im designing.

Thanks in advance for the help!

submitted by /u/loadoftoad
[link] [comments]

from The ME Hang Out https://ift.tt/2GDtTCn https://ift.tt/eA8V8J