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Choosing a Replacement Upvc Door Handle When choosing the correct replacement upvc handle, you should ensure that it is in line with the screw fix centre and the PZ measurement. They are usually located on the backplate of the handle. Most handles come with spring cassettes that aid in keeping the lever of the handle in an upright position. If your handles made of upvc seem floppy when open this could be because the spring is degrading. Inline Lever/Lever