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Types of Hinges for uPVC Doors Hinges may be the cause of a dangling or dropping uPVC doors. To ensure your uPVC doors operate smoothly, it is possible to adjust the hinges or even replace them entirely. Hinges consist of hinge leaves (or flat plates), knuckles and a hinge pin. They permit the adjustment of lateral or compression. Butt Hinges There are a variety of kinds and sizes of hinges. Each hinge has its own distinct features to meet different requirements for installation. Butt hinges are a very useful k