Lexmark W810n - Optra B/W Laser Printer Reference page 188

To adjust the finisher's height:
1
Locate the four wing bolts under the finisher's base ledge on
the side that faces the printer.
2
Turn the wing bolts counterclockwise to loosen them.
3
Turn the knobs on the base ledge to adjust the finisher's
height.
Turn the knobs clockwise to raise the finisher. Turn the knobs
counterclockwise to lower it.
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