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Conservatory Door Hinge Replacement Over time, uPVC door frames can become sagging and need maintenance and adjustments. They are often adjusted with an Allen key. Depending on the style of hinge you are using, it may be adjustable either laterally or vertically. Adjust the hinge while keeping the door shut. Start by turning 1-2 rotations and then adjust. Replacement Hinges Our selection of uPVC double-glazed door hinges comes in a varie