Sokkia B20, Operator'S Manual, Page: 39 / 60

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5) Hold the instrument on the tripod head and tighten the
centering screw. (Fig.5.3)
Fig.5.3
6) When using the spherical head tripod,
slightly loosen the centering screw, hold
the base plate
in both hands, and slide
it across the tripod head until the bubble is
in the proximity of the circular level
.
(Fig.5.4)
Fig.5.4
7) Tighten the centering screw.
8) Adjust the leveling foot screws until the
bubble is exactly centered in the center
circle. (Fig.5.5)
Fig.5.5
7
5
6