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Changing Conservatory Door Handles Switching your conservatory door handles is a straightforward job that most people will be at ease doing. It is important to first check if the handles you have include springs or not. We stock a variety of replacement handles that will fit all major uPVC double glazing manufacturers including Hoppe, Mila, Avocet Fab 'n' Fix. To choose the right handle for your door, you must check two critical measurements that are the distance between the screw fixing centers and the center of the key hole (also known as PZ