The spine inlay is made from text weight paper. The width measurement is taken from the inner marks of the paper template. The length is that of the boards. It is affixed to the cloth, aligned with the inner marks transcribed from the template, and 2.5 cm from each end (this will be flush with the boards). The paper inlay is laid on a piece of scrap paper, PVA mixture is applied to it, and it is affixed to the cloth.

If the book is from a collection that uses security/detection strips, it is at this time that the strip is attached to the inside of the spine, after the paper inlay has been affixed to the cloth.