All the Gillette Adjustable Razors are susceptible to over/underclocking (Fatboys, Slims and Black Beauties) and all can be remedied in the same manner.
I used to see the same thing with antique key wind clocks that had separate key winds for the chime and clock/timekeeping movements. People are used to turning the key in a clockwise direction for both the chime and timekeeping movements, but with many antique clocks, the chime movements were wound in a clockwise direction and the timekeeping movements were wound counter-clockwise. People would think the clocks were broken because they weren't running and they couldn't wind them, when in reality they were just wound down, so they would price them very low, or a buyer would offer less for a "non-working" clock. I've been thanked by quite a few estate sellers (and probably cursed by a few buyers) by gently pointing out the difference and then "resurrecting" a few broken clocks in their presence...
I used to see the same thing with antique key wind clocks that had separate key winds for the chime and clock/timekeeping movements. People are used to turning the key in a clockwise direction for both the chime and timekeeping movements, but with many antique clocks, the chime movements were wound in a clockwise direction and the timekeeping movements were wound counter-clockwise. People would think the clocks were broken because they weren't running and they couldn't wind them, when in reality they were just wound down, so they would price them very low, or a buyer would offer less for a "non-working" clock. I've been thanked by quite a few estate sellers (and probably cursed by a few buyers) by gently pointing out the difference and then "resurrecting" a few broken clocks in their presence...