my boat is a 1968 fiberglass i found i little rotton area around the drian plug hole,,the transome seems sturdy ,,is there any way to see or check the transome for reasurance? A experts opion would be great.. When I pull & push the motor , the whole transome, moves about a quarter inch while pulling & pushing it ,,is this normal?? i put alot of tension on it ,while testing it , it does move a bit but seems strong,, Is this transome plywood inside?? tad