model eye and its saccades

Hi,

I'm trying to model the eye and have it oscillate about it's axis with an angular velocity.

However, when I use moving mesh to create movement, I can't seem to get it to rotate about it's axis (the origin). It seems to oscillate just in the y-direction. I'm relatively new to Comsol so any kind of help will be great!

I've attached my mph file too.

Thanks!
Karthik