In the time since Tim Olsen’s article “Cylinders Don’t Make It”  [1]  the main ideas  there  havebeen  accepted,  developed  and,  finally,  simplified  and  distorted.  Many,  including  myself, remembered  it  more  like  “Only  Cones  Make  It.”  The  first  impression  that  something  in  my ideas was wrong was when I made a CAD model of a fretboard some time ago. I wanted it to have a constant curvature radius of 300 mm (around 12”). There are many customers that  still want that, in spite of offering  well-designed  conical-shaped fingerboards. My first thought was to draw two circles,  12”  diameter, one directly above the other, at the distance  from  nut to...