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If the guide has left the nest or deformed, then it can always be fixed with a wooden wedge and a hammer or just try to insert it into place. About once in there are months, check the videos on the door. In a situation, if after the check you noticed that the videos have failed, deteriorated or deformed, then they must be changed to new. After certain intervals, carry out the door adjustment: it is performed using a special lever located upstairs of the door.