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Choosing a Replacement Upvc Door Handle When selecting the right replacement upvc handle, you should check that it matches both your existing door's screw fix centre and PZ measurement. They are typically on the backplate. Most handles come with spring cassettes that keep the lever of the handle in a horizontal position. If your upvc handle is flabby, it could mean that the spring has deteriorated. Inline Lever/Lever The inline lever/lever is a contemporary design that fits perfectly into the Fab and Fix