Hi Paul, While you have the plate out turn the piano upside down, on a couple of saw horses or three chairs. Put a piece of tape, vinal may work, that CA will not stick to, over the top area of the board where the crack does not come through and fill the crack with CA. DO it in layers until the crack is nearly filled. Check underneath often to make sure the CA is not finding a path to there to make a mess. I would also lay a thin bead of medium CA along the sides of the ribs. Newton
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