I have a stupid question concerning the rear light clusters.... After unscrewing the two screws holding the plastic bulb holder on, how the.... WELL IF the plastic bulb holder does comes out then please someone HOW as I can't pull it from the car, it just moves about but I don't want to pull it too hard in case it breaks. It looks like the there is a plastic bar sticking up on the outer edge of the plastic holder to the boot cluster? [Currently wishing I had taken a photo as my description doesn't sound very helpful :-) ]