On my boat, the verticals were attached to the cleats at the top and bottom of the verticals. The cleats themselves were screwed to the deck at the bottom and to the thwarts at the top. The screw heads were visible because everything was behind the face boards.
Edit: Oops. just found the picture where we were removing the face board. We used a SoniCrafter to cut the screws holding the face board. The face board was rotten at the bottom so we were replacing it.
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