Originally Posted by
7ucky
I screwed the wedge nut back in so it stuck up a bit and gave it a few taps with the hammer. It budged, but it only moved enough so that the wedge nut is back to being flush with the top of the quill stem
Under the assumption that you have now managed to disengage the wedge: approach bike from front, hold wheel firmly between knees, now try twisting the handlebar left-right. Should be "only" rust holding it in place.