$fn=100;

difference() {
    sphere(10);
    sphere(9);
    //cube(20);
}

translate([0, 0, 9]) cylinder(2, 2, 2);

translate([0, 0, 11.3]) rotate([0, 90, 0]) difference() {
    cylinder(.2, .5, .5);
    translate([0, 0, -1]) cylinder(2, .4, .4);
}

translate([0, .1, 12.4]) rotate([90, 0, 0]) difference() {
    cylinder(.2, 1.2, 1.2);
    translate([0, 0, -1]) cylinder(2, 1, 1);
}

translate([-2.5, -9, -2.5]) rotate([90, 0, 0]) linear_extrude(2) {
    text("C", 5);
}