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of Hinges for uPVC Doors If your uPVC door is hanging or dropping, it could be due to hinges. You may need to replace or adjust the hinges on your uPVC door to allow it to operate smoothly. Hinges are comprised of hinge leaves that are flat (or plates), knuckles, and an hinge pin. They permit compression and lateral adjustments. Butt Hinges When hinges are concerned, there are countless sizes and types available. Each hinge has its own distinct characteristics to suit different installation needs. Butt hinge