I'm trying to remove the painted plastic cover on the outside mirror of a 96-s420.Alldata and the 140 dvd show that the cover comes in three sections.That information is not correct as the cover is one piece and slides off.I'm trying to detach the cover without breaking something else inside the mirror assembly.I have the mirror in the fully retracted position,but stilll am not sure how or what to detach to remove the cover.Any help would be appreciated. tx