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Replacement Double Glazing Window Handles When a double glazed window handle is damaged, it's essential to replace it that is safe and functional. uPVC handles are operated by a spinning wheel that is inserted through the middle of the handle into the lock mechanism in the window frame. You will have to be aware of the step height for your uPVC handle, which can be found by searching for screw cover caps on the inside face of the handle. Tilt Turn Tilt and turn windows are a popular choice in Europe but