Ikelite 6970.05 Instructions Manual page 16

4. Apply a very thin, even layer of lubricant to the exposed portion of
the front o-ring and to the lens port sealing surface. Avoid dry spots
or uneven build-up of lubricant.
5. Loosen the port thumbscrews until they do not show on the inside
of the lens port.
6. Align the port so that the tall projections on the dome shade are in
the 12 and 6 o'clock positions.
Shade
Thumbscrew
Zoom gear
O-ring
Thumbscrew
groove
16