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Changing Conservatory Door Handles Most people can easily alter their conservatory door handles. It is essential to first check if the handles you have have springs or not. We stock a wide range of replacement handles for all major uPVC double-glazing producers such as Hoppe Mila Avocet Fab n' Fix. You must measure two important measurements to choose the right handle. The distance is the distance between the screw fixing centres and the central point of the keyhole (also called PZ c