Has anyone ever removed this clear thing that hides the screw? I removed the brown, male knockdown cover. Then I removed the screw. I thought that would allow me to remove the clear, female part in the picture but it won't come out. Are they glued in there? I worked slowly around all sides with a thin blade trying to ease this thing out, but it wasn't budging. Before I pushed too hard, I thought I'd ask you very smart people! Any suggestions? (I will of course put the screw back in once the clear thing has been removed.)