On the 1982 DS II the mast is hinged on a fitting attached to the "stump" of the mast, which is then inserted through a hole in the top of the cuddy and attached to a standard mast-step fitting in the "floor" of the cuddy. That mast-step is held to the cuddy floor by 2 sheet-metal screws whicg are threaded into a 3/4" plywood plate under the fiberglass floor of the cuddy. Unfortunately, if any water has stayed i nthe bilge, the dampness wil l eventually rot out/delaminate that plywood. My 1979 model had the same setup originally, but without the hinge, it was one-piece from that step up to the top of mast. The plywood had rotted out mostly by the time that I bought hte boat in 1996 and the first winter after I bought the boat I ended up cutting an access panel in the cuddy floor to be able to replace that plywood. I did a better job later including totally coating the new plywood in epoxy resin to waterproof it. I would not give up on the boat yet! This is fixable, and not hard if you are OK with a bit of interesting repair or OK with bringing boat to a repair shop. It is not the end of the world, this is fixable! I can find some pictures of my completed repair for reference, but I actually had more to repair since there is a plastic pipe under that cuddy floor that transfers the downward force of the mast to the boat bottom, and mine was located just slightly forward of the actual mast-step causing the floor to crack, so I had a bit more rebuilding than I suspect you have (I HOPE!). But anyway, to start with, there should be a pin or bolt (maybe a couple of screws or rivets?) that hold the lower mast-step to the bottom of the mast, removing them will give access to the screws that should hold the step to the cuddy floor, if you are lucky, you may be able to carefully fill the holes with thickened epoxy resin, then redrill the holes after the resin cures and carefully screw the step back in place, I would then place a hose-clamp around the mast just below the inside of the cuddy top to better lock the mast stump into the boat. Realistically, I'd want to replace that plywood under the cuddy floor (could use Starboard or PVC instead?)piece needs to be at least 8" square, centered under the step and will need to be fitted either around that plastic pipe that I mentioned, or maybe it will fit between the top of pipe and underside of cuddy floor. The blocks (pulleys) that are part of the CB raising tackle are also screwed into that plywood piece under the cuddy floor, I actually added a 1/8" thick aluminum plate under my maststep (on top of the cuddy floor) it is "possible" that doing so might take the place of the plywood under the floor although it may affect vertical position of mast, causing standing rigging to be a little too long not sure. My big project last Spring, was to convert my mast to basically the same setup that the 1982 models had, I now have a hinge just above the top of the cuddy.