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Changing Conservatory Door Handles Most people can easily change the handles on their conservatory doors. It is important to first find out if your current handles have springs or not. We have a wide selection of replacement handles to suit all major uPVC double glazing manufacturers including Hoppe, Mila, Avocet and Fab 'n'Fix. To choose the right handle for your door, you must be sure to check two crucial measurements that are the distance between the screw fixing centres