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Replacing uPVC Window Handles It is simple to change the handles on windows made of upvc. It is essential to ensure that the replacement handle is fitted into the spindle cutout of the window mechanism. If you follow the steps below the handle of any cockspur will fit in most windows. The most important thing is the step in the height of the handle. What to look for A large portion of windows in the UK are fitted with uPVC handles and, over time, they can begin to show signs of wear and tear