It is recommended that you first divide the information into several piles (otherwise it is impossible to penetrate 50 cm thick at once), draw a unified binding position, then drill holes (the holes should be larger otherwise the thread cannot pass through), and then merge them into Use a thick thread and a large needle to sew back and forth like sewing clothes, and finally tie a tight knot at the punched hole, and press the knot into the punched hole to ensure smoothness after binding.