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Changing Conservatory Door Handles Changing the handles on your conservatory door is a simple job that most people are at ease doing. To start with it is crucial to determine if the handles you have are sprung or not. We stock a large range of replacement handles for all the major uPVC double glazing manufacturers, including Hoppe, Mila, Avocet and Fab 'n'Fix. You need to take two crucial measurements to choose the right handle. These are the distance between the screw fixing centers and the central point