//body and paint are separate so that we can "chip" the paint
#declare disc_magnet_body =
union {
  difference {
    union {
      cylinder { <0,0,-0.015> <0,0,-0.205> 0.375 }
      cylinder { <0,0,0> <0,0,-0.22> 0.36 }
    }
    cone { <0,0,0.005> 0.12 <0,0,-0.04> 0.09 }
  }
  torus { 0.36 0.015 rotate 90*x translate -0.205*z }
  torus { 0.36 0.015 rotate 90*x translate -0.015*z }
}
#declare disc_magnet_paint =
union {
  difference {
    union {
      cylinder { <0,0,-0.020> <0,0,-0.210> 0.380 }
      cylinder { <0,0,-0.005> <0,0,-0.225> 0.365 }
    }
    //have to make same hole in paint cylinder as in body; slightly larger
    cone { <0,0,0.005> 0.13 <0,0,-0.05> 0.1 }
  }
  torus { 0.365 0.015 rotate 90*x translate -0.210*z }
  torus { 0.365 0.015 rotate 90*x translate -0.020*z }
}