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Types of UPVC Door Handles When your upvc door handle needs replacing it's essential to find the right replacement for your home. A locksmith can provide and install high-security uPVC door handles with extra security features. The most important measurements to take are the measurement A (also called PZ) and the length of the backplate. Check these measurements to ensure your new uPVC handle will fit. Lever/Lever A lever is a solid bar pivoted around a point (known as a Fulcrum). When you apply force to the e