In my kitchen ,I have a door knob that will not come unscreened. I have tried WD-40 and 3 in 1 oil to try to loosen but with no luck. There is a slight gap between the door and the knob..big enough to get a thick dental floss in between...but not large enough to use a dremel power tool cutter. Are there any suggestions on how to remedy this situation??? Thanks for any suggestion...