SwampYankee,
Mine (on a 1976 20' SF) slide right off with room to spare in front of the splashwell. The track has holes in it that take the pins (verticle) from 2 gate type slide bolts that are attached to the forward corners of the box. Here's a picture of the tracks with the positioning holes that's on my boat. Thet are the small holes; the large ones are for the fasteners that hold the track to the deck. You can also see the dirt mark the the left hand edge of the seat left on the track.
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Looking forward to seeing photo's of your boat. I'm working under a blue tarp as well. New tank is due next week, hope to have the tank coffin cover done by then. Next step is to rehab the console (inside, in the cellar), then scuppers, re-wire and hope to get an engine and have it ready for this season.