This is a very fine and nice cardboard, with the exact width for this task: about 1 mm.
Application of leather "ribs" to the cardboard:
Cutting a leather cover for the spine:
Taking measures and then putting some glue on the right place:
Stretching the leather on the spine, which in turn rests on a PVC tube, on my thighs:
Several turns of nylon rope help to bond the glue:
Final aspect:
Final aspect, with a nice embossing from the pressure of the rope:
Previous publication on this topic:
https://steemit.com/handmade/@strontiumtoad/bookbinding-images-the-beginning
https://steemit.com/handmade/@strontiumtoad/bookbinding-images-improved-press
https://steemit.com/handmade/@strontiumtoad/bookbinding-images-nowadays