I have a badminton racket like this, and one of them is broken. Is it necessary to pull the net again? If you want to pull, how many Jin should you pull?

There is no need to pull the string again. Generally, places where badminton is pulled are not willing to help you pull. First, it's useless to pull a dozen catties. Second, if the racket is broken, you can't buy it. Third, businesses will always find an excuse for you to buy another one. Unless you can pull the racket by yourself (you need the corresponding tools), so spend more than 100 yuan to buy a common brand racket. Note that this brand is specially made for badminton rackets. Commonly used Boli, Kaisheng, Kawasaki, Li Ning, Shengli, etc.