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Replacement Handles For UPVC Windows uPVC window handles can loosen and drop off. With the appropriate tools, it's simple to replace them. Check for the screws or pins that hold the handle in place to identify the kind of handle. Once you have identified them, remove them and then gently drag the handle away from its spindle. Espag Handle Espag handles are typically found on double-glazed uPVC Windows. They're flat and have a circular shape. They are typically made of uPVC but they could also be made of other material