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Choosing a Replacement Upvc Door Handle The best choice for a replacement upvc door handle involves checking that it matches the measurements of your door's PZ and screw fix centres. These are typically found on the backplate of the handle. Most handles come with spring cassettes that keep the lever of the handle in the horizontal position. If your upvc handle is floppy, it could be that the spring has become damaged. Inline Lever/Lever The lever/inline lever has a modern design that perfectly fits in