We get barnacle growth in our centerboard trunk every year. Sometimes it is enough to make the board get stuck in the 'up' position.
Every year I use a long key hole saw or something more rigid then a hack saw blade to work around the edges and watch the piles of barnacle shells pile up underneath.
The access is not great but I can reach the slot with our boat sitting on it's cradle.
"The cure for anything is salt water~ sweat, tears, or the sea." ~Isak Denesen
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