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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 using an Allen key. Depending on which style of hinge you have, it may be adjustable either laterally or vertically. It is recommended to adjust with the door closed and begin by turning 1-2 full rotations, then adjust. Replacement Hinges Our range of uPVC double-glazed door hinges includes a range of sizes for flag, butt,