pull up the frame surrounding the gaiter, then pull the gaiter up like taking a jumper off, it will snag, at the bottom of the gaiter is a plastic sleeve secured by a one-shot hose clip. It needs replaced with a worm clip when done, you have to cut it off with pliers etc.
I havent figured out how to use an aftermarket knob with the standard gaiter.....anyone?
(mines an 02 btw)