How to assemble a book with thread?

The thread is an ancient thread: first, you have to determine the position. Generally, the position of threading (that is, the position of punching holes) is 20 cm away from the back of the book. You can also set it according to your own book, as long as you don't put the words in the book. Then you have to punch, punch. You know, there must be a binding length. The drill should be based on the thread you wear. Just fill the hole after threading, and it's not too crowded. It looks good. Then the thread. The ancient line must be a double line. Finally, put the thread in the hole to make sure it looks good. The details are important, and then it will be fine. If you feel weak, you can reinforce it at the junction, so an ancient line will be fine.