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Types of Hinges for uPVC Doors If your uPVC door dangles or drops it could be because of hinges. To ensure your uPVC doors work smoothly, you may need to tweak the hinges or replace them completely. Hinges are made up of hinge leaves flat (or plates), knuckles, and an hinge pin. They allow for lateral and compression adjustments. Butt Hinges When hinges are concerned there are many sizes and types available. Each hinge has its own distinct attributes to suit different requirements for installation. However, but