I cut the 5 gallon pail long enough to stick about a half inch beyond the plywood after you place it through the hole in the wood top. This way, I have a caulking lip where the wood meets the pail's plastic. I also screwed the sidewalls of the pail into the edge of the wood top. As NIB suggested, #12 x 3/4" stainless pan heads. The second picture is the underside of the wood top. The third is a view from the top.
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