NNormally the tuning of a Gadung should remain stable for at least one year in normal use. In recent years, the existing instruments have proven themselves in this; stability is one of the qualities that Gadung stands for. In the unlikely event that the tuning will not remain stable enough in the first year with normal use, then it is important to contact me via email@example.com, so that I can correct the possible problem. Should a problem arise due to an accident or other external factors, it is also important to contact me directly. However, there may be costs involved in repairs. Quality and satisfaction are very important to me; in consultation we will search for the best solution together.