If you go down the hole route rather than the bent coathanger, you need to drill through the underneath of the headlamp unit right in the middle (there's silver sticker there) so when you poke a rod through the hole you can intercept and gently bend the white plastic socket into which the headlamp adjuster ball should sit. You can judge exactly where the hole needs to go by looking for the socket that you'll need to push against. Only needs to be a small hole (4mm) and be careful the drill doesn't slip else you'll mash up the insides.