Mirror wiggle

[JudgeM]

Hi all and happy new year,

I've got a bit of an issue with my mirrors. They wiggle back and forth a little bit.

This a bit annoying when driving at certain speeds, with the wind they move back and forth quite a bit.

Any suggestions as to how I can stop this ?

I've put a video that shows the what happens:

http://youtu.be/YDpK9kZHwoc

Thanks.