You should be able to prise the cover off, sometime clipped in or undo with a screw or allen key. When the cover is off then you should see how to adjust it.
Gee I must be sad, I'm still on holiday! I came in the internet cafe to cool down from the beach and look what happen
sad addicted geek springs to mind....you are on holiday masona for gods sake, the world will cope without you!!!! Have a good one and ill expect a sarcastic reply when you return from sunny skegness!
Have you had a look at the top of the cover to see if there is any fixing there?
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