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Replacing uPVC Window Handles Changing upvc window handles is a simple task. The most important thing is to make sure that the new handle is a good fit for the spindle cut out in the window mechanism. If you follow the steps below, any cockspur handle will fit in most windows. The height of the step of the handle is key. What to look for Over time, uPVC handles on many windows in the UK begin to show signs of wear and tear. The handle of the window may become loose or difficult to operate when this occurs.