Hi all, I have read the other thread about removing the 4 knobs from the heater/ac controls by just pulling very hard on them. Not only have I pulled very hard on them, I have used a pry bar to the point that I'm afraid something is going to break. Has anyone had this same problem? Is there some kind of a spring clip that has to be depressed to release the knob? Should I apply heat with a heat gun, which is probably a bad idea, hence causing damage to the plastic lenses? I have been putting wd40 on them to no avail. Are these knobs just corroded on to the shafts that badly? any help or advise is appreciated, Ro65