1. First, repair the front and back sides of the whistle with a steel knife. When repairing, the steel knife should be placed on the whistle and gently scraped on the whistle surface. The thickness of both sides of the whistle surface should be uniform, and the middle part of the whistle surface should not be repaired.

2. After the whistle is repaired to a certain extent, it needs to be blown slowly to see if there is a reed film inside the whistle and whether it is cracked inside. It needs to be repaired step by step. If the whistle is repaired too much at once, it will make the whistle thinner and unusable;

3. It is suggested to use flat sorbet sticks and cigarette paste. When pasting, it is usually pasted on both sides of the whistle, not in the middle, because it will lead to the collapse of the whistle spine and make the timbre worse;

4. After the surface of the whistle is branded, if the whistle part is in the shape of jujube pit, it can be polished and repaired again.

Supplement:

Most professional whistles of suona are made of reeds, and the quality of reeds can determine the timbre of suona. When choosing reed whistle, you should pay attention to the following points:

1, whether the surface of reed whistle is smooth and whether there is tower ditch phenomenon;

2. Whether there are cracks inside the reed whistle;

3. Whether there is a reed membrane in the reed whistle;

4. The root of the reed flute should have a spine, and the curved surface should be parallel and natural.

Extended introduction:

The plastic suona whistle was developed by Yang Xiusheng, vice president of Jilin Art College, but it has not been successfully developed, so it is considered as a semi-finished product. Its pronunciation stability and intonation are not as good as Shao great man's. It is reported that the plastic suona whistle cannot be repaired. Still, there is some information that the whistle can be repaired.

If you still want to try to repair the plastic suona whistle, you can refer to the following steps: first, prepare a steel knife, a whistle base (usually made of chopsticks) and bamboo pieces (used for opening the whistle), then insert the whistle into the whistle base, put the whistle on the bamboo pieces, scrape off the impurities and oxides on the surface with a steel knife, and finally soak the whistle in warm water for a few minutes to restore its elasticity.

However, considering the characteristics and difficulty of making plastic whistle, it may be a better choice to improve your playing skills. Besides, you can try to use traditional reed flutes, because they are usually better in pronunciation stability and intonation.