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Types of Hinges for uPVC Doors Hinges may be the cause of a falling or dangling uPVC doors. It is possible that you need to replace or adjust the hinges on your uPVC door to allow it to work smoothly. Hinges consist of hinge leaves flat (or plates), knuckles, and the hinge pin. They permit lateral or compression adjustments. Butt Hinges When hinges are involved there are many kinds and sizes available. Each has distinct features to meet different requirements for installation. However, butt hinges are an extrem