I am trying to address a broken door stop and possibly bent window guide. I followed the directions in the Bentley Book but there's a fitting in the center of the door, behind the arm rest, that the book does not mention, except as part of the re-install instructions. I can see it clearly looking up from the bottom, but I can't get it to separate, can't even see what to pry on. Does this just pop off, or am I missing something?