Poor string tension in a badminton racket leads to poor performance and play: The birdie doesn't spring as high on a serve or travel as far when knocking it over the net. Restringing the racket corrects this problem. You can do it yourself if you have a restringing machine or take it to a professional for maintenance. Expect to pay between £325 and £650 for a restringing machine, but it will pay for itself over time if you're an ardent badminton player. Carefully follow the directions, though, or you will ruin your racket.
Buy replacement strings. Gut strings are softer, but synthetic strings last longer. Similarly, thinner strings give you better play, but lose their tension faster than thick strings.
Choose the amount of tension you want in the strings. You can aim the birdie better with tight strings; loose strings allow you to lob the birdie farther.
Write down the string pattern on your racket before taking the strings off. Failure to to duplicate this pattern when you restring the racket will destroy the frame.
Clip out all of the old strings.
Clamp the head and neck of the racket into the stringing machine. It should stay firmly in place throughout the restringing process.
Unroll 40 feet of your string and loop it through the first vertical hole of your racket's head. Pull it down to the racket's neck and then back through the next vertical hole. Repeat this process for each vertical hole.
Feed the string into the machine and, depending on the model, pull it taught with weights or a hand crank. Rackets usually require a tension between 7.26 and 11.8 Kilogram. Cut off the excess string and tie a knot when you finish.
Set the horizontal strings using the same method; weave them around the vertical strings according to the correct pattern. Cut off the excess string and tie it off with a double knot.
Release the racket from the clamp and take it to the badminton court for a test.