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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 in a way that minimizes the risk of draughts. But they require regular maintenance and adjustments to function smoothly. Most uPVC doors use flag hinges, one part attached to the door edge or profile and the other is fixed to the frame. These can be adjusted both horizontally and laterally to accommodate the movement of the door sash. Locks with a problem If you notice that the loc