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Types of Hinges for uPVC Doors If your uPVC door is hanging or dropping, it could be because of hinges. It is possible that you need to replace or adjust the hinges on your uPVC door in order for it to operate smoothly. Hinges are comprised of hinge leaves (or flat plates) along with knuckles, and a hinge pin. allow for the lateral or compression adjustment. Butt Hinges When it comes to hinges there are numerous sizes and types available. Each hinge has its own unique characteristics to suit different instal