C. Mechanical maintenance
1. Adjusting the tension of the focus.
Tension comes pre-adjusted by the factory. The best point of tension is that which permits
the focus knobs to move as loosely as possible, without the head sliding down with its own
weight.
The tension adjustment collar for focussing (Fig.1) is situated between the focussing knob
(18) and the head holder (17).
a. Loosen the screw located in the collar hole with the 2mm hexagonal key.
b. To increase the tension, turn the collar anti-clockwise; to decrease it, turn the collar
clockwise.
c. Re-tighten the hexagonal key.
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