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Types of Hinges for uPVC Doors If your uPVC door is dangling or falls it could be because of hinges. You may have to replace or adjust the hinges on your uPVC door to allow it to operate smoothly. Hinges are made up of flat hinge leaves (or plates), knuckles, and the hinge pin. They allow for lateral or compression adjustments. Butt Hinges When hinges are involved there are numerous sizes and types available. Each hinge has its own distinct characteristics to meet different installation requirements. Butt hin