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Changing Conservatory Door Handles Many people are able to change their conservatory door handles. To start with it is essential to know if your existing handles are sprung or not. We have a wide selection of replacement handles to suit 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. This is the distance between the screw fixing centres and the centre of the keyhole (also