$fn = 400;

difference() {
    union() {
        rotate_extrude() {
            translate([4, 1, 0])
            circle(d=2);

            translate([40, 1, 0])
            circle(d=2);

            translate([4, 0, 0])
            square([36, 1]);
        }

        translate([0, 0, 90.5])
        scale([1, 1, 0.7])
        rotate_extrude() {
            translate([5, 1, 0])
            circle(d=4);

            translate([39, 1, 0])
            circle(d=4);
        }

        translate([0, 0, 1])
        cylinder(h=90, d=82);
    }
    
    cylinder(h=92, d=6);

    translate([0, 0, 5])
    rotate_extrude() {
        translate([7, 0, 0])
        square([30, 92]);
    }
}