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Replacing uPVC Window Handles Changing upvc window handles is a simple task. It is essential to make sure that the new handle fits inside the spindle cutouts in the window mechanism. If you follow the steps below the handle of any cockspur will fit in most windows. is the step height of the handle. What to Do You Look For? A lot of windows in the UK come with uPVC handles and, over time, they will begin to show signs of wear and tear. The window handle may become shaky or difficult to operate when this occurs