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In addition to being exactly 18 inches below the top of the tub, the fulcrum point also needs to be centered between the front and rear of the tub, which we have already determined to be 18 inches, since the total distance is 36 inches. We used a piece of string, some tape, and a pen to make our radius. Obviously, the piece of string needs to be exactly 18 inches long between the tape and the pen tip. We taped one end of the string to our fulcrum point and marked the new wheeltub radius on our inner tub panel.