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Replacement Handles For UPVC Windows uPVC window handles can become loose and fall off. Fortunately, replacing them is a simple task with the right tools. Determine the type of handle you own by looking for screws or pins that are used to secure it. Once you've identified them, take them off and carefully drag the handle off the spindle. Espag Handle Espag handles are the most commonly used type of handle found on double-glazing uPVC windows. They are round and flat