This drawing by Dr. Giorgios Boudalis, Head of the Book and Paper Conservation Laboratory, Museum of Byzantine Culture
shows the sewing of the codex. This sewing is identical to the sock sewing but with the major difference of course that it incorporates the gatherings of the bookblock.
For further information visit
https://www.bgc.bard.edu/gallery/exhibitions/80/the-codex-and-crafts-in
or buy the Book!
https://www.amazon.co.uk/Codex-Crafts-Antiquity-Georgios-Boudalis/dp/194179212X
or watch