Take the wood out...we have seen several boats crack at the center of the keel in the same spot...this happened to a boat I sold a while back... certainly no crack when I sold it...I live in Calif where it's relatively warm most of the time...the keel is made from fir as you stated and is a sponge for water...the theory on the cracking is that in colder climates where it freezes the glass expands and then shrinks...that along with beating the s#*t out of your boat will get you a leak...
strick
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"I always wanted to piss in the Rhine" (General George Patton upon entering Germany)
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