How to replace the broken spring? -- Model K
1. Remove the head and reverse the body, use scissors to cut the sewing which is used to fix the zipper at the tale.
2. Open the zipper.
3. Use a needle-nosed pliers to clamp the spring, press it inside, move the spring out of the frame, and finally lift the spring.
4. Align the upper end of the new spring with the position inside the frame, press the lower end of the spring with your thumb and insert it into the frame.
5. After replacing the spring, close the zipper.
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