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Why Door Hinge Replacement Is Essential For a Secure Conservatory Hinges are necessary for a sturdy, secure door that is operated properly to minimize draughts. But they require regular maintenance and adjustment to function smoothly. Most uPVC door frames are equipped with flag hinges. One is attached to the edge or the profile of the door sash, and the other is fixed on the frame. They can be adjusted laterally and vertically in order to accommodate the movement of the door sash. Locks that aren't work