Welcome to the forum.
Does the water leak from the exterior to the cockpit, or does it leak below to the salon?
If it leaks to the salon, then the process I used may be useful.
When I replaced my shrunken screw cover I sequentially removed each screw retaining the frame to the hull and squirted ample RTV silicone into the hole before replacing the screw.
When I replaced that screw cover, that had shrunken in length to expose the ends, I cut the ends at an angle that matched the interior of the frame pocket. I also cut it at the maximum possible length, for a sung fit in the pockets.
The original part lasted only a few years before the ends were exposed. My replacement has lasted well over a decade.
