Shaky n/s mirror

[uhhu]

Hi all,

I have searched for this - but no results showed.

My wind mirror is shaking like crazy when I'm driving, the faster I go the worse it gets. I like to drive fast, so I would like to get this fixed.

The actual casing is fine, and the mirror moves fine with the electrics. So it's just loose I reckon.
Can anyone point me in the right direction as how to fix this?
Whether it can be tightened up, should the mirror be removed then put back in?
If I take it off, do i need to buy anything to put it back in, etc.?

Any help or pointing in the right direction would be great.

Cheers