In a partially drunken state I dropped my Optio S, while it was on, onto a stone floor. All that seems to have happened is that the three outer metal rings of the lens have come off. The camera still works but I have been reluctant to take a photo with it in the present state.

Can I just clip back on the three pieces (there are two tiny springs attached to the outermost piece) or am I missing something like a elastic band or o-ring??

If it is beyond repair by me - is it expensive?