#declare push_pin =
union {
  cylinder { <0,0,-0.3> <0,0,0.25> 0.018 texture { chrome } }
  sphere { <0,0,0> 0.05 scale <1,1,0.1 > translate <0,0,-0.3> texture { chrome } }
  cone { <0,0,0.25> 0.018 <0,0,0.375> 0 texture { chrome } }
  difference {
    sphere { <0,0,0.01> 0.17 scale <1,1,0.8> }
    box { <-1,-1,0> <1,1,1> }
  }
  cylinder { <0,0,-0.01> <0,0,-0.4> .09 }
  cone { <0,0,-0.375> .11 <0,0,-0.44> .125 }
  difference {
    sphere { <0,0,0.275> 0.3 }
    box { <-1,-1,0> <1,1,1> }
    translate <0,0,-0.44>
  }
  interior { ior 1.5 }
}