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Replacing uPVC Window Handles It is simple to change the handles on upvc windows. The most important thing is to ensure that the new handle is a good fit for the spindle that was cut out of the window mechanism. If you follow the steps below the handle of any cockspur will fit most windows. The height of the step of the handle is important. What to Look For Over time, uPVC handles on many windows in the UK may begin to show signs wear and tear. Whe