We had a '78 Islander with the same problem. I loosened all the turn buckles and got a jack in there. I put the jack across one of the stringers a little further aft and then I got in there with a sawz-all and cut out the compressed plywood floor. I cut the flooring away about half the width around the two adjacent stringers then I took a two inch thick piece of maple plank I had and cut that down to size to it would slide in under the compression post with the two plank ends carved down so it would rest on the stringers then epoxied the whole thing in. I sold the boat a while later, so I don't know how well the repair held up over time, but it did the trick in the short run.
1983 Fraser 41
La Conner, WA
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Boating for over 25 years, some of them successfully.