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Choosing a Replacement Upvc Door Handle When selecting the right replacement upvc handle, you should make sure it matches your door's screw fix centre and the PZ measurement. These are typically found on the backplate of your handle. The majority of handles have spring cassettes that aid in keeping the handle lever in an upright position. If your handle is loose, it could be that the spring has deteriorated. Inline Lever/Lever The lever/inline is a modern handle design that fits perfectly into the Fab