auto gearstick problem

The button on my LR2 gearstick had a bit of wire/metal sticking out of the button location preventing the button from being pressed in, fiddled with the wire and it disappeared back behind the button. It is causing the button to stick on occassions and can be heard rattling

How do I remove the gearstick and gain access behind the button?

Thanks

found link to remove gear knob, would have struggled with out

http://www.freel2.com/gallery/albums/userpics/11383/Selector Lever Knob.pdf

New knob delivered £28.40