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Replacement Double Glazing Window Handles When a double-glazed window handle is damaged, it's crucial to replace it that is safe and functional. uPVC handles are operated by the spindle, which is inserted into the middle of the handle, and then into the lock mechanism inside the window frame. The step height of a uPVC handle is determined by looking at the screw cover caps on the inside of the handle. Tilt Turn Tilt and turn windows are a popular option in Europe however they have only recently begun