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Changing Conservatory Door Handles Most people can easily alter their conservatory door handles. It is important to first find out if your current handles are spring-loaded or not. We stock a wide range of replacement handles for all the major uPVC double-glazing companies, including Hoppe Mila Avocet the Fab n'Fix. You must measure two important measurements before you choose the best handle. These are the distance between the screw fixing centres and the centre of the keyhole (also known as PZ