Wow, very interesting!! That cog seems to be in a really unfortunate and uncomfortable position! Were you able to adjust it by turning it blindly?
I was able to adjust the cog with a PH2 screwdriver. The screwdriver needs to have at least 200mm long shaft to reach the cogs deep inside the engine compartment.
The four teeth on the PH2 screwdriver work as a small gear to turn the cogs behind the headlight.
This video explains it surprisingly well:
https://www.youtube.com/shorts/_DVoR4NecqYI recommend parking in front of a wall, in a dark place (or at night) and keeping the headlights on while you adjust them, so you can see the light beams move on the wall. Also cover the other headlight with a towel, so only the headlight that you are adjusting shines onto the wall, and you can see it move more clearly.
