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Changing Conservatory Door Handles Most people can easily alter their conservatory door handles. It is crucial to find out if your current handles are spring-loaded or not. We stock a wide range of replacement handles for all major uPVC double-glazing companies, including Hoppe Mila Avocet and the 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 centre of the keyhole (also called PZ centres). Lever/lever