M_Boats: Centerboard jams - update

With all the barrier coat and bottom paint removed, holding a straight edge vertically inside the trunk, the opening *at the bottom* is uniformly ~0.020" narrower per side (0.040"+ total) for both sides. The board jams at the very bottom of the slot when raising or lowering. Is that how the boat was built? Maybe to minimize flopping of the centerboard when lowered? This area of the trunk needs to be sanded away to make clearance for bottom paint. Never mind a barrier coat. Jeff