At last I have got round to binding new watercolour pages into an old cover. I chose this French grammar book from my shelves because I liked the size (11x16cm; 4.5x7"), it was in reasonable condition, easy to take apart and I didn't think I'd ever need it. After I'd taken the pages out, however, I started to read them and thought how much better French grammar was explained therein and if only I'd had such a book when I was at school... To do the rebinding, I followed Jan's instructions - very easy and satisfying. Thank you Jan for inspiring me.
More technical details requested by Jana: In this book, there are 5 signatures(sets of pages). Each signature is 3 rectangles of paper, folded in half to make 6 pages, 12 sides. The paper is Arches watercolour, cold-pressed, medium rough, 185gm/M2 - this makes a spine thickness of about 1 cm. Jan hasn't explained how to do the stitching. I already knew a method or two - I now want to do another with smooth paper so maybe I will do some diagrams of the stitching method as I go along. If you are comfortable with a needle, this rebinding of a book takes only a couple of hours, you get the pages you want, any extras added in that you fancy and the pages open flat.