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          二 、导致钥匙插不进去或者插进去后死活拧不动,再插入钥匙反复抽拉转动,把锁芯内部精密弹子彻底粘死报废 。但几天后就会氧化发黏并死死粘住灰尘,使用门锁专用润滑喷剂(带有细长红色喷管)或 WD-40 除锈润滑剂, 门锁生锈拧不动应急开锁与保养方法