Yep it is me selling the knob on ebay. Its quite straight forward, although I wrecked the old gearknob taking it off, it was fooked anyway and just could get enough purchase on it with the mole grips, so I just hack the knob off (the leather/ plastic bit) with a saw and was left with a big metal nut type thing, this was a lot easier to grip with the mole grips and came straight off. I think it can vary as they are glued in place a little and its depends how much glue was put on, good tip it to try tightening the knob a little first and then unscrew...
sorry for the long winded explaination, basically if your not fussed about messing up the current knob its easy...