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Changing Conservatory Door Handles Many people are able to change the handles on their conservatory doors. It is crucial to determine if your current handles are spring-sprung or un-sprung. We stock a large range of replacement handles for all the major uPVC double glazing manufacturers including Hoppe, Mila, Avocet and Fab 'n'Fix. To select for your door, you must be sure to check two crucial measurements that are the distance between screw fixing centres and the center of the key hole (also call