$fn=64;

difference() {
    hull() {
        translate([0, 0, 0]) cylinder(r=3, h=5);
        translate([0, 50, 0]) cylinder(r=3, h=5);
        translate([110, 0, 0]) cylinder(r=3, h=5);
        translate([110, 50, 0]) cylinder(r=3, h=5);        
    }      
    translate([30, 3, 0]) cylinder(d=3.5, h=5);
    translate([90, 3, 0]) cylinder(d=3.5, h=5);
    
    translate([30, 43, 0]) cylinder(d=3.5, h=5);

    translate([5, 7, 0]) cube([50, 30, 5]);
    translate([-3, -3, 1.5]) cube([120, 10, 2]);    
}

    translate([70, 0, -5]) cube([3, 50, 5]);