DRIVER'S SIDE SHOULER BELT BECOMES FRAID AND STARTS TO UNRAVEL. THIS SEEMS TO BE OCCURRING ON OTHER CORROLLAS WITH THIS RESTRAINT SYSTEM. (92'S HAVE TWO BELTS; A LAP BELT AND A SHOULDER BELT) IS THERE A RETRO- FIT AVAILABLE? THIS PROBLEM SEEMS VERY DANGEROUS. PLEASE ADVISE. THANK YOU.*AK