Changing the gearknob is easy.
Feel through the gaiter to the part closest to the front of the centre console for two clips, pull them up. Next slide the gaitor and securing assembly backwards towards the handbrake to set it free then pull it up and over the gearknob. Pull the gearnob clip off with a pair of pliers (This clip can't be removed and reused) then move the gaitor back down and pull off the gearknob.
Securing the gaitor back onto a new gearknob can be fixed in the same way the old clip was, but can be done with a jubliee clip!
