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Replacement Handles For Windows Window handles are among the most frequently used elements of your double-glazed windows. Over time, they may become rusted or worn out. You'll have to know your current handle's spindle length and its fixings to replace it. The best method to do this is to examine the base of your old handle. Handle Over time, uPVC window handles and locks can be damaged through wear and tear, or even intentional damage. It could be that the handle or lock becomes difficult to open or close, or that they are not even locked. I