Cheap, quick and easy to do, Moleskine-like notebook with Clairefontaine paper

Step 5 Glue the cover on the notebook

Now the cover should be ready.

glue one side at a time, don't forget to glue only the ends of the pen holder's elastic bands, or it won't have enough elasticity to stretch over the pen.

when the two sides of the cover are glued on the Clairefontaine notebook, you can fold the margins on the inside of the book. Look closely at picture 3, you'll see a slight problem: the first two pages are glued together with the cardboard flap of the notebook! So you can't fold the margins over the inside of the cardboard flap without modifications.
One solution I found works best, is to take the three of them and fold the margins over the 2nd leaf of the notebook. For my first notebook (this is the 2nd one) I tried to cut these 2 pages off and the result was a weaker notebook, and pages going over the borders of the cover. (Go to see the 2nd pic of the step #3 to see the pages going over the cover on my 1st notebook.)
having 2 leaves reinforcing the cardboard flap also helps to have a harder cover.

Don't forget to glue the margins before folding them on the inside.