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Changing Conservatory Door Handles Most people can easily change the handles of their conservatory door. It is crucial to find out if your current handles are spring-loaded or not. We have a wide selection of replacement handles to suit all major uPVC double glazing manufacturers, including Hoppe, Mila, Avocet Fab 'n' Fix. You need to take two crucial measurements before you choose the best handle. These are the distance between the screw fixing centres and the center of the keyhole (also known as PZ c