@Uilebheist @riley I don't have a stapler big enough for A4 but I have strings made for macrame and needles, which is enough for some book binding.
The way I do it is 3 holes, one in the middle and 2 each 1cm from the side. String on the outside go in from the edges holes, come out from the center then I tighten everything and tie a knot around the outside part of the string.