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Types of Hinges for uPVC Doors Hinges can be the reason of a dangling or dropping uPVC doors. To ensure that your uPVC doors are operating smoothly, it is possible to tweak the hinges or even replace them entirely. Hinges are made up of hinge leaves (or flat plates) along with knuckles, and a hinge pin. They permit compression and lateral adjustments. Butt Hinges There are many different kinds and sizes of hinges. Each has distinct characteristics to meet different requirements for installation. Butt