If you have the correct pair of extractors, then insert both into all 4 holes and push fully down (and inwards towards the radio) This should push in all the 4 springs locking the radio into its casing ...At the same time (with assistance?) attempt to pull out the radio..It is fiddly but should work. note: if you are attempting to do it using 4 separate pieces of wire /small screwdrivers etc instead , then it is important that ALL 4 are pushed in at the same time to release the 4 springs otherwise it won`t work.
RegWorts
May 2008