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Conservatory Door Hinge Replacement Over time, uPVC door frames can become sagging and need maintenance and adjustments. They are usually adjusted using an Allen key. Depending on the design of hinge it might be adjustable laterally, vertically or both. It's best to adjust with the door closed. start by turning 1-2 full rotations before tweaking. Replacement Hinges Our selection of uPVC double-glazed door hinges comes in a variety of sizes for flag, butt and rebate hinges. All of our replacement hing