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Changing Conservatory Door Handles Most people can easily alter the handles on their conservatory doors. It is essential to know if your existing handles are sprung or un-sprung. We have a wide selection of replacement handles to suit all the major uPVC double-glazing manufacturers like Hoppe, Mila, Avocet Fab 'n' Fix. To choose the best handle for your door, check two critical measurements the distance between the screw fixing centres and the central point of the key hole (also called PZ centres). Lev