Turn the wheel so that you have room to put a flat tip screw driver in between the collar and shaft and tap it into there, forcing it to spread out a little, then just pull it off. Maybe some wd-40 spray to help it along. There is a brown wire that is for the horn that is up at the top of the shaft so when it does come loose, be carefull not to break it. Do a search on the ignition lock cylinder and there is a picture of the brown wire location I am talking about. That fit is pretty snug on that collar, even after it is loose enough to come off, it still holds it pretty good.