Oldsmobile 2003 Alero Owner's Manual page 263

I
Start with the horizontal
aim. The adjustment
screws can be turned with
an E8 Tom
@
socket.
Once the horizontal aim is adjusted, then adjust the
vertical aim.
Horizontal Aiming
Vertical Aiming
1. Turn the horizontal aiming screw until the indicator
is
lined up with zero.
2. Turn the vertical aiming screw until the level bubble
is lined up with zero.
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