color("#b3b3b3")
difference() {
  cylinder(d=12, h=15, $fn=150);
  translate([0,0,1])
  cylinder(d=10, h=20, $fn=150);
}

color("#b3b3b3")
translate([0,-5,7])
rotate(90, [0,1,0])
difference() {
difference() {
    cylinder(d=12, h=1.0, $fn=150);
    translate([0,0,-0.6])
    cylinder(d=10, h=1.8, $fn=150);
}

translate([-6,0,-0.6])
cube([12,6,1.8]);

}