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Changing Conservatory Door Handles Most people can easily change their conservatory door handles. It is important to first check if the handles you have are spring-loaded or not. We have a variety of replacement handles for all the major uPVC double-glazing manufacturers including Hoppe Mila Avocet and Fab n' Fix. It is important to measure two key measurements to choose the right handle. These are the distance between the screw fixing centers and the center of the keyhole (also known as PZ centres).