Ikelite 71301 Instructions Manual page 19

3. 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.
4. Align the port thumbscrews with the recesses in the housing's port
mount.
Recess
Thumbscrew
Recess
Recess
Thumbscrew
Thumbscrew
19