[PSUBS-MAILIST] Hatch/Hatch Ring Flatness Evaluation

[Steve McQueen via Personal_Submersibles]

All, I am evaluating my K-250 hard hatch/tower ring mating. This hard hatch
was custom made for this K-250 by the previous owner.

When the hatch is closed (w/o-ring removed) and the interior of the sub is
brightly lit I notice I can see light between the hatch and hatch ring in
places. The "gaps" are not huge and I believe with the o-ring installed no
light would be seen.

However I believe it tells me there are some flatness issues in this
interface. In a perfect world I should see no light.

My questions are, what is a precise way to identify the "high points" and
is grinding the hatch surface vs. the tower ring the right surface to
modify?

Steve
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