Maybe try soaking it for a while first, then temporarily clamp it in place and hit it with a hot air gun to heat and dry it. It should hold its shape against the adjacent strake of planking.
Allan
Now here's one that will likely make me look like a pain in the arse, but strictly as an FYI for anyone interested. The rabbet along the keel ends short of the stern post. I doubt 1 person in 10,000 will notice/care but for anyone interested.....
Rabbet ends at station 20 on
Agamemnon. Ending somewhere short of the post was the norm, at least in most of the 18th and 19th centuries, but I haven't the slightest idea why they did this. The only information I could find was this AI description:
In British ships of war (and traditional wooden shipbuilding in general), the rabbet of the keels, a groove cut into the keel to accommodate the planking, would stop forward of the sternpost. This construction method ensured the keel and the sternpost could be properly joined
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