Fendi sunglass repair question

  1. I have a pair of Fendi sunglasses I got at Nordies about a year & half ago. The one side seems to be stripped from wear & use. The screw cannot be tightened. Is there anywhere I can take them for repair or am I just out of luck. I absolutely adore them as they are the pair with the rhinestones on the sides of the lenses in F.