Those are machine screws. There should be nuts underneath or nut plates embedded in the rail under the gelcoat.

But it wouldn't surprise me if the machine screws were just threaded into wood or even threaded into epoxy. I've found more than a few questionable things which needed to be properly "re"engineered.
Let us know what you find once you dig into this problem.

Todd T.

On Sun, Jul 25, 2021, 11:10 AM Rick Lange <sloopblueheron at gmail.com> wrote:

> Hi Thomas,
>
> Would you prefer gelcoat damage?
>
> Never mount a dockline holding cleat without a backing plate.
>
> Regards,
>
> Rick Lange
>
>
> On Sun, Jul 25, 2021 at 11:02 AM THOMAS POLISE via Rhodes22-list <
> rhodes22-list at rhodes22.org> wrote:
>
> > Anyone else notice that the jib track is just put in without bolts.  I
> > added cleat to track which was yanked out in high winds.
> >
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