Adjustments for headlights don't do anything?

You need to be like a good 30 feet back to see the difference while you adjust them. The one closest to the fenders adjust up and down. The one accessible from the top adjusts left and right.

 

I don't agree with the 30' back thing. I've needed to adjust mine a few times for various reasons and I back it up about 10' from my garage door, which has horizontal and vertical lines in it. Note that small corrections at 10' have bigger affects when on the road.

I have also run into the case where the lights don't seem to move much. I use my variable speed drill along with a flexible connector and a phillips bit. Adjusting them by power at slow speed works well. When they aren't adjusting any more, try turning the other adjuster a few turns one way or the other, then go back to the first one. This has worked for me.

I haven't had the lights apart on the adjuster level to understand how they work, but, on mine anyway, after so much turning they seem to stop or bind up.

 

When you are further back, you can see the adjustment much better. Instead of basing the adjustment off of something so minimal. If you wanted to see how many rotations your tire makes within 5', which would be easier? Looking at the hub cap or your tread?

Also, over adjusting can potentially "pop" the adjusters off of the threads of the adjustment screws. Trust me, I've been there.

 

Whoops, sorry about that, I didn't mean (no matter what I said...) that 30' isn't optimal, it's just that 30' may not be feasible. 30' back for me puts me in my neighbors yard, and they really hate it when I do that.

As for the adjusters "popping" off, any more details? not sure if I actually have done this or not. The OP may be in that boat to.