Two Copernisis...stuck on both

[Horshu]

I've got a gold and a black Copernisis...had the gold one for over a year. This thing has driven me crazy, as I got the equation compartment open and presumably solved the equation (based on Puzz' suggestion, I did some division and added the digits). I think I even have the right celestial bodies, based on the copernisis.com web site. Where I'm stuck is that I can't tell how to get the compartment open (or even if I have the right combination that would allow it to open). Could someone provide me some tips as to how to open? I looked at a vid online, and it seems like you knock it on the bottom and then the key chamber will come out if you tap it to the right, but it's not working for mine. I've had the thing so long, I just want it open...I got the satisfaction of what I thought was solving the puzzle for it, but it feels like I'm stuck on implementation.

[Orko]

At the first time, my chamber also dindn`t come out, so a made a little hook ( papaerclip), then with a little pull i got it open. Maybe thats not the best way to get the chamber out, but for me it worked.

[JRBigBird]

I did the same as Orko.

[kev_in_cornwall]

If I remember correctly you can hear when the internal locking mechanism releases (in which case a hook may be helpful in extracting the key chamber)