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second, there is some kind of debris in the chain hinge, which causes the chain to be knotted.
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second, poor stiffness of the sprocket shaft can also lead to severe side wear.chongqing dijier technology co., ltd. is committed to improving the quality of entry doors and popularizing electronic locks, so that more consumers can experience intelligent life and enjoy the safety and convenience brought by digital electronic locks. mainly engaged in customized italian armored doors and entrance doors; yale and digier smart locks; door lock hardware, guaranteed product quality, safe and durable.