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Replacement Double Glazing Window Handles It is crucial to replace a broken double-glazed window handle to ensure safety and efficiency. uPVC handles operate on a spindle which is inserted into the middle of the handle and through the lock mechanism in 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 common option in Europe but they have only recently begun to make an impression here in