$fn=120;


module oben() {
  difference() {
    union(){
      cylinder(d=50, h=3);
      translate([0,0,3]) cylinder(d1=50, d2=10, h=3);
      for(i=[0:360/3:359]) rotate([0,0,i]) hull(){
        translate([20,0,0]) cylinder(d=15, h=3);
        translate([30,0,0]) cylinder(d=12, h=3);
      }
    }
    for(i=[0:360/3:359]) rotate([0,0,i]) translate([30,0,0]) cylinder(d=6.5, h=20, center=true);
    R=6.5;
    for(i=[0:360/6:359]) rotate([0,0,i]) translate([25-4-R,0,0]) hull() {
      translate([R/2,0,0]) scale([0.5,1.1,1]) cylinder(r=R, h=20, center=true);
      translate([-5,0,0]) cylinder(d=4, h=20, center=true);
    }
    cylinder(d=6.5, h=20, center=true);
  }
}

module unten() {
  difference() {
    union(){
      cylinder(d=50, h=2);
      translate([0,0,2]) cylinder(d1=50, d2=16, h=3);
    }
    cylinder(d=6.5, h=20, center=true);
    translate([0,0,3]) cylinder(r=10.2/sqrt(3), h=10, $fn=6);
  }
}

translate([0,0,5]) oben();
translate([0,0,-5]) mirror([0,0,1]) unten();