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Replacing uPVC Window Handles Switching the handles of windows made of upvc is a fairly straightforward job. It is important to ensure that the replacement handle is fitted into the spindle cutout of the window mechanism. If the steps below are followed correctly, any cockspur handle should fit most windows. The step height of the handle is key. What to Find Many of the windows in the UK are fitted with uPVC handles, and over time they will begin to show signs of wear and