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A service of all passages is necessary once a year. If you can do this yourself,

the following procedure is to be followed:

Unscrew and unmount all the control switches in the housing with the

small socket screw key (gears, exposure lever shaft, wedge caps, se-

lector switch shaft, ...).

Remove the o-ring out of its groove. Use the control shaft or a non

metalic tool.

Wash axe and o-ring with soap (do not use degreasers), rinse with

fresh water and dry thoroughly or let it dry for a while.

Slightly grease with Hugyfot-grease.

Position the greased o-ring in its groove, gently slide the axe back in

and mount the control switch back to its proper position.

When the control switches are mounted you may mount the camera

into the housing. Now check all the controls on their proper function-

ing.

Always perform a pressure test after removing/installing control switches or

perform a testdive without camera inside the housing.

Hugyfot Housing for

Nikon D90

User manual