here, the drill is:
// the values of the various radius may be wrong, it's a freestyle writing
difference {
 cylinder {<0.0, 0.0, 0.0>, <10.0, 0.0, 0.0>, 0.75}
 blob {
   threshold 0.6
 #local nbS = 500;  // nb of sphere for precision
 #local nbT = 10;  // nb of turns
 #local ii = 0;
 #while (ii < nbS)
   sphere{<0.0, 1.0, 0.0>, 0.4, 1.0 translate 10.0*(ii / nbS)*x rotate 
nbT*360.0*(ii / nbS)*x}
   #local ii = ii + 1;
 #end
 }
}

         David.

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