C.Plath NAVIGAT X MK 1 Mod. 10 Operator's Manual page 53

NAVIGAT X MK 1 Mod. 10 / SR-180 MK 1 Mod. 10
23) Tighten the captive screws in a series of
diagonal opposites.
24) Remove the outer end of the ventilation
valve from its neck.
25) Fit the funnel into the hole for the centering
pin. Fill up the gyrosphere container with
supporting fluid until excess fluid exits from
the valve neck. Remove the funnel from
the gyrosphere container.
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