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Types of Hinges for uPVC Doors If your uPVC door is dangling or falls it could be due to the hinges. You may need to change or adjust the hinges of your uPVC door in order for it to operate smoothly. Hinges are made up of hinge leaves (or flat plates) as well as knuckles and a hinge pin. They permit the adjustment of lateral or compression. When it comes to hinges there are many sizes and types available. Each hinge has its own distinctive characteristics to fit different requirements for installation. Howev