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I installed these yesterday. They are pop up mushroom cleats that I got from Great Lakes Skipper. http://greatlakesskipper.com/doral-boat-spring-loaded-cleat-stainless-steel-1-inch-single
I put them in to tie up my jet ski or other ski boats when we are rafted off. I will never use these voids in the platform for davits so I found something useful to go in there.