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I made my own with HDPE and a hole saw. The hole saw leaves a hole in the middle of the circle piece and I use that to put a SS bolt through. The bolt then goes through a piece of metal on the other side which spans the larger hole. Then a washer and nut, tighten it up and the hole is covered. I did this to cover a hole in the coaming from where I removed the AutoHelm control head.
Notice: The advice given on this site is based upon individual or quoted experience, yours may differ. The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.