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Choosing a Replacement Upvc Door Handle When choosing the correct replacement upvc handle, you should make sure it matches your door's screw fix centre and PZ measurement. They are usually found on the backplate of your handle. Most handles come with spring cassettes to help keep the lever of the handle in an upright position. If your handle is loose, it could be that the spring has degraded. Inline Lever/Lever The lever/inline i