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Replacement Handles For UPVC Windows uPVC handles can loosen or break off. With the right tools, it's easy to replace the handles. Identify the type of handle you have by looking for screws or pins that secure it. Once you have identified them, remove them and then gently drag the handle off its spindle. are commonly found on double-glazed uPVC Windows. They're flat with a cylindrical shape. They are typically made of uPVC however they can be made from other materials, based on the style and design