The problem: Under the plastic cap there\'s water in the space below the cabin floor, and the foam is soaked. An access port will be needed.
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We\'ll use a router with a spiral upcut bit to make the hole. Luckily I have a multi-purpose router base and with a wooden plug to fit the existing hole, it will guide the circle cut.
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Blue tape will help prevent chips or tearout while cutting.
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I made the cut in several passes, lowering the bit each time.
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