Esprit is hull 324 and had been from the Great Lakes to Florida (originally sailed out of somewhere in New Jersey, I think) through 4 different owners. It probably didn't have quite the corrosive environment you experienced but there was galvanic corrosion, no doubt. My recollection was that I had to drill at least one screw head off and remove that screw with vice grips once the track was removed. I know Bob Engle (Whim, hull #52) actually cut his track into sections to get it out but I don't think that was necessary. My guess is with the application of the penetrating solution and an impact tool, you should be able to get the screws out. I chased the threads with a tap (1/4-20 if I recall correctly) and used new stainless screws. I did apply never seize to the screws before I put them in. If you don't have confidence in the remaining aluminum, you can send a print to the Garhauer indicating where you want the holes and drill and tap new ones. I didn't find that necessary and I suspect you won't either. All the screws took up as tight as I could make them with a big screw driver and considering how many there are, that load should be taken up to the point that the fiberglass deck will tear before the screws pull out.
Once you remove the 4 screws that hold the wooden rails in place, the hatch cover will just lift off. The screws are regular wood or sheet metal screws. I take those caps / rails / whatever you call them home with me in the winter while the boat is covered because it is easier to keep up with the finish in my shop so mine come off regularly.
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