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Choosing a Replacement Upvc Door Handle When choosing the correct replacement upvc handle, you should check that it matches both your existing door's screw fix centre and the PZ measurement. They are typically on the backplate. The majority of handles have spring cassettes that keep the lever of the handle in the horizontal position. If your upvc handle seems loose, it could be that the spring has degraded. Inline Lever/Lever The lever/inline is a modern handle design that perfectly matches to the Fab and F