1. First, remove the coil wire. There are two small buttons on both sides of the coil wire. Press them gently, and the coil wire can be removed from the wire cutter.

2. Adjust the coil thread. Gently pull apart the ends of the coil wire, and you can see a small hole in the middle of the wire. Use a small needle or toothpick to pass through the small hole and twist it gently until the position of the thread end is adjusted to the appropriate position.

3. Fix the coil thread. Gently press both ends of the thread end to fix it on the thread trimmer.

4. Test coil thread. Reinstall the thread end to the thread trimmer, and pull out a short piece of thread to see if the thread end is fixed, smooth and normal.