Not sure but I'll ponder a guess
Hi Sean,I tried to rebed some of my life line stanchions, my 98 240 has the straight up two bolts straight through design. Those were into the aluminum plates. I tried longer bolts and nuts on the stanchions before i figured out they were bedded into the aluminum plates.I would think the stern rail seats are bedded in the same sort of way. This weak bedding of the stanchions is one of my few gripes about the 240. Another would be the uphaul on my swing keel. It's very difficult to raise. I need to use the winch and handle to raise mine.