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Choosing a Replacement Upvc Door Handle When selecting the right replacement upvc handle, you should ensure that it is in line with your existing door's screw fix centre and the PZ measurement. These are usually located on the backplate. Most handles come with spring cassettes that keep the lever of the handle in an upright position. If your handles from upvc are loose when they are opened, this could be because the spring is deteriorating. Inline Lever/Lever The inline lever/lever is a modern handle desig