I have a couple of British Gillette safety razors. I think they are either Aristocrat Jrs. or Rockets. But they have patent number 430, 030. The rivet that holds the razor head to the handle has come loose causing the razor head to turn in circles on the handle. My question is; is this very common for these types of razors to have this defect, or are only a few razors affected? Or will they all eventually do this with wear and tear?