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Pete T said...
So two things can happen either the plugs roll in the foam, this happens in surf boards if the plugs are not glassed into the deck so to do this on a windsurfing you would require to rout out a deep hole depending on the thinkness of the board, secondly the tabs on the fins can snap of due to the side way force.
pete
My Bombora trifin had the same problems at over 35kn.
As soon as you hit 35kn the side fins were generating too much lift and the boxes rolled inwards.