Why not use something like a toggle bolt to fasten the cleat. It isn't ideal, but it is a hell of a lot better than relying on screws in relatively brittle fiberglass. I'm thinking of something like this:
Which would be relatively easy to install, and if you wanted more security with it, you could always inject thickened epoxy around it to secure it to the hull and prevent any water intrusion.
It is essentially retrofitting a tapped metal plate into the hull as JRP mentioned builders sometimes do.
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
If you're new to the Sailnet Forums... please read this To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Still—DON'T READ THAT POST AGAIN.