I did something similar to this in my "Radio Graves" scene for the IRTC.  I
was making knobs for some of the radios.  I think you may be able to use the
same idea here.

Here's the source, and a quick render using the "Basic Scene" template.
Hope this helps.

#declare Knob =
  object {
    difference {
      intersection {
        cylinder { <-0.5,0,0>, <0.5,0,0>, 0.4 }
        cylinder { <-0.5,0,0>, <0.5,0,0>, 0.4 rotate z*60}
        cylinder { <-0.5,0,0>, <0.5,0,0>, 0.4 rotate z*120}
        scale <1,1,1.5>
      }
      plane {-z, 0}
    }
    texture {
      pigment {rgb <1,1,1>/255} //almost black
      finish { diffuse 0.6 specular 0.9 roughness 0.01 reflection 0.08 }
    }
  }

-- 
Jeremy

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