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Why Door Hinge Replacement Is Essential For a Secure Conservatory Hinges are a must for a secure, strong door that can operate effectively to reduce the risk of draughts. But they require regular maintenance and adjustment to ensure smooth operation. Most uPVC doors have flag hinges. One is attached to the door sash edge or profile and the other is fixed to the frame. They can be adjusted laterally and vertically to accommodate the movement of the door sash. Locks that aren'