Not sure which year/model 20' you have but I am guessing its an SF? If it hasn't been modified then the cleats are probably backed with a block that has been glassed over then bolted through with a nut and washer. I would imagine that if there is no other logical way to access the hardware under the cap that you could remove the vent and get access there? I am newer SeaCraft owner with a hawse pipe setup so my access to the stern cleat is different.
If you can, post a picture or two.
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