The higher the number, the more aggressive the setting. You actually started on the highest setting. Also, you have to open the razor doors BEFORE turning the adjustment knob to actually get the adjustment to work. This all assumes your vintage is in good working order.
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I'm a big fan of vintage Gillette adjustable safety razors. They're especially handy when using a DE razor for the first time. I started on 9, now I'm down to 5 as I've gotten the hang of it and want a closer shave.






