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So I tried to remove pages carefully, and decided very soon, that it is a light job. The book is built up 4 folded paper sewn together, and these bundles are glued together.
Find the middle one with the threads.
Cut the thread.
Remove the pages one by one. The hardest is the 4th one, which is glued. Leave the 4 pages together.
Cut a piece of thicker paper for the cover, a little bit larger as the sheet for the spine.
With this thing - I have no idea what the name is :D scratch 2 lines for folding by the spine.
Attach the cover and secure with paper clips.
Use it happily :)
For what? I created 2 small notebooks with the daily pages for note taking, and from the monthly pages also a thin booklet: I will use this for the next years dates. This solved my hard problem to have a place to write future dates (because in the Avec you have just one extra month). To overwrite the current dates I used a corrector pen.