'92 Headlight Adjustment Gearbox Mystery

[oldoutboardjim]

I attempted to adjust the vertical adjustment on my 1992 LS400 by turning the appropriate Phillips-head screw. Unfortunately, there is a physics-related mystery that I cannot understand. Here goes:

When you turn the vertical adjusting screw, the gearbox turns the horizontally-mounted adjustment screw. When this horizontally-mounted adjustment screw turns, it pushes the bottom of the headlight to change the vertical alignment. Okay, all good so far.

But the bottom screw has a tab on the head that prevents it from turning! How can you adjust the headlight if this screw is not designed to turn?????

[oldoutboardjim]

I found the answer. It appears that there is a gear that is mounted onto (screwed onto) the horizontally-mounted adjustment screw (horizontal adjustment gearbow shown): This gear was basically seized. A little cleanup and some plastic-friendly grease made everything good again.

[steve2006]

Thank you for posting this information and the picture,I give mine an occasional turn one way then the other then back to where they were along with a squirt of lubricant to keep them free to move.