Extra cleats
Adding extra cleats is not rocket science. NB gives good advice in his 5th paragraph, and I would only add a few suggestions. If possible, site the cleat on a surface allowing full contact with the boat surface (you don't want it to 'rock'), use a waterproof caulk to seal the cleat to the surface on both the topside and inside of the boat. If possible, inside the boat, use a large enough piece of plywood as a backer to cover all the mounting holes.
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