I then folded it so that the narrower strips were valleys and the 1cm areas were mountain folds. I put ultra tacky tape and stuck the mountain backs together to leave me with a cover front and back with five stuck together peaks. To cover the outside of the spine I turned the strip I’d cut so that the other side was showing, scored around 2cm in from one edge, stuck it to the outside of the front and spine, scored where the back was and wrapped it around and stuck to the back.