I only "discovered" this when watching a central locking kit service man do his thing...as I know I would have gone crazy later on trying to remove the trim...and broken it for sure. I made it a point of watching the mobile phone installer fit a fixed-phone kit to my new T5 transporter as the dash trim gaps are much tighter on the T5 and there aren't as many smaller pieces to remove as before (which makes it easier working on a T4 I think) and "learnt" a few tips that will come in handy come GPS install time.