It's quite cool, because you press the top of the ashtray and the lid sort of slides and turns to the right on a little spring thing.
I have switched the axis upside down because , well the mouse is in upside down, but have not switced the buttons so they are still reveresed, but I hav e got used to it. I did have them the right way around , but found sometimes windows 'forgot' that setting and reverted back to normal.
I did intend (read still do) to mould it so the curves and the back bit with the whole are gone, but have never got around to it, and it's been there over three years.