Some swelling is desirable. Place under weight on edge of bench and gently tap spine concave with wooden dowel. Glue spine and leave to dry. Line spine between tapes with linen. Leave the linen as long as the tapes on each side.
Board construction is of the split board type.
The four edges of the top board may be cushioned for neatness. Endbands may be sewn on through the linen spine lining. The spine should be lined with eight or more layers of strong paper. Enough to ensure that the spine cannot flex. With heavy books or better quality work, a yapp edge about 4mm high may be glued around the squares on both boards.