SATO SATOLINE MESH Guide D'utilisation page 13

4-D-Armrest (option)
Push the button to adjust the height
(7 positions) of the armrests. To set the
width of the armrests: Loosen the lever, move
the armrests into the desired position, and
tighten the lever.
By lifting and pushing the armrest pads
to the left or to the right, they can be rotated
in 3 positions.
The armrest support can be pushed to easily
adjust its depth.
7. Height-adjustable lumbar support
(optional)
If your chair has a height-adjustable lumbar
support: The screw on the rear of the backrest
can be loosened to enable the height of the
lumbar support to be adjusted. Place the
support in the required position and then use
the hand wheel to lock it into place.