Ok, thanks Bruce, I might do it up sometime soon. I had a look in my manual and it shows a special tool for undoing the crank pin, is there another way of doing that or do i need the tool?

Good spotting Joe, thats a Kincrome 1/4inch socket set, I use it almost everyday. I leave it out and it saves me having to get my 3/8 socket set or my 1/2 socket set out of the cupboard.