Step 6: Sew in the ribbon with a lockstitch
Next, push the threaded needle through the second hole in the fold and up into the ribbon at the very selvedge edge.
Push the needle back out through the same hole through which you entered. Pull the thread taut, being careful to not tear through the plastic.
Move to the next hole and repeat the process. This is your lockstitch--it allows the ribbon to move freely to the right or left and out of the way of the text you are reading.
End by pushing the needle back into the ribbon at the point of the last piercing in the fold, knotting the thread around the selvedge there, and cutting the thread close to this last knot.