Re: SCUPPERS / CLAM SHELL
Yeah it'll create a vacuum, but you could just do a wedge in front of the scupper instead of the clamshell. I've always used 3/16 to 1/4 of the diameter of a drain as the height of the trailing edge for the wedge. You can also notch the wedge around the drain but I don't think it's necessary at all for what you want.
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Thank goodness that in the scheme of things you are broke, powerlesss and inconsequential, because with the shortsighted alternatives and idealogy you have you'd be much worse than those you complain about.
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