Spiral Notebook Hacks

I made a new cover for a spiral notebook that I have similar to https://www.instructables.com/id/The-Amazing-Twist-Locking-Cardboard-Sketchbook/.  The cover kept slipping between the gap in the spiral when I would open the book so I sewed the gap closed with dental floss.  It has held up very well seeing as it hasn't broken in the 6 months since I first did it.