I was cleaning out the special tools section of my box. I came across this. Do you know what it is for? I am sure the Cap'n will know right away. I thought I would have some fun with this.

for aiming round headlamps... I think

Yes, that is what it does. You can aim your headlights at home. I have not seen one of these in years.

It's for aiming a round headlight..high/low beam type...they are made for the rectangle ones too....

Cool How do they work ?

I like foggy nights, screw what's legal, you can see where they go.

pretty good!

It's hard to get past Step One in the instructions: Find A Perfectly Level Location but assuming you can manage that, the tool indexes on the bumps that all sealed beam headlights have and shows the inclination from vertical via the bubble level.

That's it.

You're on your own for side-to-side aiming.

What would be cool is to modify this and mount a pencil type laser pointer in the middle. Now you can easily do side to side alignment.

you can do that with a cheapo laser level, just position it horizontal aiming to the other light and measure that same distance from the light that the level is from the light and make adjustment to match.

.....also...up against the wall
(that would work better!)cool tool

My shop doors have the horizontal ridges in them and that makes it easy to get both sides level, centering and heigth is to my preferences as they don't check them any more at the inspection station. I also have one of those tools somewhere in my special tools drawer or hanging on the wall or in a cabinet or in a box somewhere.

Talking about adjusting headlights, my 91 suburban has the 4 rectangular lights and the adjuster screws plastic nuts have started letting go at random, one at a time, not while I'm adjusting them. I either notice a light crooked or it shines down in front at a extreme angle. I bought eight new adjusters but I've been putting them in one at a time as they give up.