Can anyone tell me how to change the dip pattern (ie to drive on the continent) of the HID lights in my 172 Mk2. The dealer says I have to buy a clip-on for the outside (£45.00!!!) but I have read that most HID lights have a shutter to set the beam pattern. Its not obvious on the back of the light units - has anyone done this OK, or has anyone dismantled the light units & can give me any info?