I have a homelink I want to add to my excursion and upgrade my expedition one to the voice recorder. I searched enough to find the visor is a plastic clamshell design but I can not get it to open. I can get a putty knife in the seam but I can not pry the two halves apart. Any one know how to open it? More important does anyone have pictures? I have exhausted google searches, but probably using the wrong key search words.