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Replacement Handles For UPVC Windows uPVC handles can become loose or fall off. Thankfully replacing them is a simple job with the proper tools. Identify the type of handle you own by examining the screws or pins that secure it. Once you've found them, take off the screws or pins and gently take the handle off of its spindle. Espag Handle Espag handles are the most popular type of handle that is found on double-glazing uPVC windows. They're flat with a cylinder shape. They are typically made from uPVC