I actually just installed new Lewmar Ocean 70 forward and Ocean 30 for the salon hatch.
The old Atkins & Hoyle hatches came off pretty easy, and filled the old holes and sort of matched the old gelcoat over the old screw holes. The old hatches weren't remotely centered on the openings, especially the salon hatch. We centered the new hatches athwartships, but had to take some liberties fore and aft so that we could average out how much of the deck we had to grind away to fit the dogs and the hinges.
The whole job took 3 days, but only working about 2-3 hours each day to avoid rain storms and actually go do other fun things over the long weekend
Grinding out the recess to accept the hinges was really easy with a dremel. We went slightly oversized, then painted some gelcoat into the new cutouts. At no point did we have to excavate far enough to hit core or any voids in the laminate.
I'm really happy with how easy it was and how it came out. Our hatches seal well and we've had days of storms here in Beaufort with no leaks. Way easier job than rebedding, replacing gaskets and screens on the Beckson ports...
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