USA#I

A. Lever to lock clamping arm to surveyors spindle.
B.
 Surveyor spindle.
C.
Vertical height  adjustment spindle.

D. Your hand piece.

E. Hand piece locking arm lever.

F. Hand piece locking thumb-screw.

G. Hand piece arm.

H.
Thumb-screw to lock hand piece arm.
 

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