Types of Hinges for uPVC Doors If your uPVC door is hanging or dropping it could be due to the hinges. To ensure your uPVC doors are operating smoothly, you may need to tweak the hinges or replace them completely. Hinges are made up of flat hinge leaves (or plates), knuckles, and an hinge pin. They permit the adjustment of compression and lateral. Butt Hinges <b
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