I am in the middle of a total resoration of a 29 Leatherback. Its first time restored. All the wood is rotten where any fitting, bolt, screw, or nail was used. In the areas that were not bad the wood was dried out and brittle and would not hold screws well.I'm replacing all of it. If your frame is sagged and it probably is and the wood is bad at the joints I don't see how any door adjustment can last long term. If it is an older restoration was the wood replaced at that time. There are different opinions on what constitutes a restoration. Overspraying the exterior, installing new interior and a majored engine is not restored to me it's extensive maintanence.