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Replacement Handles For UPVC Windows uPVC handles can loosen or even fall off. With the appropriate tools, it's simple to replace them. Determine the type of handle you own by looking for screws or pins that secure it. Once you've found them, remove the pins or screws and carefully pull the handle off of its spindle. Espag Handle Espag handles are commonly found on double-glazed uPVC Windows. They're flat with a cylinder shape. They're typically made from uPVC