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Why Door Hinge Replacement Is Essential For a Secure Conservatory Hinges are essential for a secure, strong door that can operate properly to minimise the risk of draughts. But they also require regular maintenance and adjustments to function seamlessly over time. The majority of uPVC doors are fitted with flag hinges, one part attached to the door edge or profile, and the other fixed on the frame. These can be adjusted both horizontally and laterally to accommodate the motion of the door sash. Locks with a