I received the same notice in the mail yesterday and inspected the situation. Mazda is being very proactive here on an issue that is very minor. Using all the imagination I could muster, I think they are concerned a fingernail could get caught in the small gap/crack that is on the backside of the steering wheel at 6 o'clock. I think this might be possible with long fingernails that were trimmed in a suitable shape to bind in that crack. In that case you could perhaps break a nail and crash your car. Possible? Perhaps. Am I concerned? No. My finger nails are never long enough to have an issue.