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Changing Conservatory Door Handles Many people are able to change the handles on their conservatory doors. It is essential to know if your current handles are spring-sprung or not. We stock a broad range of replacement handles for all major uPVC double-glazing companies such as Hoppe Mila Avocet and the Fab n'Fix. You must measure two important dimensions to select the correct handle. These are the distance between the screw fixing centres and the central point of the keyhole (also called PZ centres). Lever/lever You may wish to alter the handle styl