1. Use a small steel ball or a paper clip and place it on the lowest part of the joint.
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2. Shape the curved curve of the lid so that it is naturally close when it is normally covered.
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3. Shape the contact surface of the magnetic suction buckle so that the lowest point contacts first.
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4. In the lowest part of the middle of the lid, put 1 to 3 yuan coins to increase the weight and combine the two faces by gravity.
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5. Sew or glue a button under the magnetic buckle.