%translate([0, 0, -50]) cylinder(h=100, d=15.5);
difference() {
  union() {
      cylinder(h=10, d=20);
      polyhedron(
          points=[
            [-10, 15, 0],
            [10, 15, 0],
            [10, 15, 10],
            [-10, 15, 10],
            [-5, 5, 0],
            [5, 5, 0],
            [5, 5, 10],
            [-5, 5, 10]
          ],
          faces=[
            [0, 1, 2],
            [0, 2, 3],
            [0, 7, 4],
            [0, 3, 7],
            [4, 6, 5],
            [4, 7, 6],
            [1, 5, 6],
            [1, 6, 2],
            [7, 2, 6],
            [7, 3, 2],
            [0, 4, 1],
            [1, 4, 5]
          ]
        );
    };
    translate([0, 0, -1]) rotate([0, 0, -150])  cube([10, 10, 12]);
    translate([0, 0, -1]) rotate([0, 0, -120])  cube([10, 10, 12]);
    translate([0, 0, -1]) cylinder(h=12, d=16);
    translate([0, 0, 5]) rotate([-90, 0, 0]) cylinder(h=20, d=3.5);
    translate([0, 7.75, 5]) rotate([-90, 0, 0]) union() {
        cylinder(h=2.5, d1=7, d2=3.5);
        translate([0,0,-4.5]) cylinder(h=5, d=7);
    }
};