Ive got a 2006 A3 and cant work out how to remove the rear passenger light cluster (brake lights gone). In the manual it says remove the circular plastic trim then using a philips screwdriver turn the bolt. Well the bolt doesnt have a slot for any screwdriver. Can see a nut at the other end but can get to this (was thinking ratchet with extension but havent got a hollow extention to fit the bolt through). Any ideas??