I picked up a '58 fat boy . It is a good shave and functions flawlessly until ...... the adjustment ring only goes to 7. It turns freely with the requisite clicking until it gets to just before the 7 and then it stops cold. Anyone have any ideas on how I might repair this ? I have soaked the razor in Scrubbing Bubbles and Mineral Oil. I have also sprayed a lubricant in it with no improvement. It is a gold plated razor so boiling is out. Any help will be greatly appreciated.