Step 5: Sewing It All Together
This is the hardest step. First, cut three pieces of ribbon that are long enough to be able to wrap around your signatures. Tape these to the edge of a table, with a length of ribbon the width of the pages on the table and the rest hanging off of it.
Put the concertina top side down and put a signature in the first fold. Start sewing according to the diagram (pic 2). At the end of row three, follow the picture instructions about making the knot to hold the book together (starts at pic 9). Do this twice. Continue sewing, making the knot twice at the end of every row. When you have finished the last row, tie off by making the knot three times, not two, and secure it with a square knot. Cut off the excess.