Two-line book binding steps

Two-line book binding steps
1) Measure the thickness and length of the book
2) Select the size, pitch and length of the spiral according to the thickness and length of the book.
3) Debug the machine.
4) Cut the spiral to the required length
5) Place the back cover on top of the front cover
6) Insert wire C-shape (if calendar binding, insert hanger)
7) Closed double loop line
8) Flip the back cover backwards
9) Make sure the binding is complete