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Take a look at this video when you have a moment. He goes into showing a 1959 Fatboy, adjusting and shaving with it. ‪GILLETTE FATBOY 1959 SAFETY RAZOR SHAVE Instructional Badger Brush Shaving Cream & Feather Blade‬‏ - YouTube
If done right you won't feel any whiskers for quite some time when you are done with a good DE razor shave.
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The Slim is a fine shaving instrument. The settings go from 1 (juvenile peachfuzz) to 9 (aggressive). Try dialing it to 3 and work on technique first. Once you master technique, you'll be able to achieve BBS in short order. Get a blade sampler to find a current production blade that you'll like. Look at estate sales, rummage sales, antique malls and the like for vintage Gillette, Schick, Wilkinson Stainless or Personna Tungsten blades for real treat.