This morning I got up and finished the rivnut installation of the access cover on the DS foot box top. Getting the rivnut locations to line up with the cover required some resizing of the access panel holes.
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The parts from McMaster-Carr arrived this afternoon and I installed the access panel with these knobs:
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Here is the profile view of the knob from McMaster-Carr
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Carl
I may add a gasket material to make it more weather tight.