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Choosing a Replacement Upvc Door Handle When you are choosing a replacement for your handle made of upvc, check that it matches both the screw fix centre and PZ measurement. These are usually located on the backplate. The majority of handles have spring cassettes that keep the lever of the handle in a horizontal position. If your upvc handle seems floppy, it could be that the spring has deteriorated. Inline Lever/Lever The lever/inline lever has a modern look that perfectly fits into the Fab and Fix portfoli