We can repair the concave part of the dust cap in the following ways, by pulling up the concave part with transparent glue, sticking the concave part of the dust cap with transparent glue, and then pulling it up vertically, while lightly pressing the edge of the concave part Part, control the strength, and repeat the operation a few times. If the dust cap is made of metal, you can use hot-melt glue to tap on the concave part, and then gently pull it up after cooling, and finally clean up the hot-melt glue. The last one is more professional, but the repair works best. Use hot-melt glue to remove the dust cap of the audio speaker. After repairing the concave part, clean the glued part, apply white glue and stick it back. If the technology is not good, it will easily cause damage to the paper cone. This method is not recommended for non-professionals.
