1. To unscrew a dustproof cap of the gate. |
2. To moisten the gate with water or saliva. If bubbles are formed, to screw up the gate a reverse side of a dustproof cap.
Prevention
It is possible to apply only a metal dustproof cap to tightening of the gate.
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3. Again to check the gate. If bubbles are again formed, and the gate is not screwed up any more, to replace it. |
4. To screw a dustproof cap always. |
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