$fs = 0.4;
$fa = 1;
union(){
    cube([60,20,10],center = true);
    translate([5,0,9.999]){
        cube([30,20,10],center = true);
    }
    translate([-20,-15,0]){
        rotate([90,0,0]){
            cylinder(3, r = 8,center = true);
        }
    }
    translate([-20,15,0]){
        rotate([90,0,0]){
            cylinder(3, r = 8,center = true);
        }
    }
    translate([20,-15,0]){
        rotate([90,0,0]){
            cylinder(3, r = 8,center = true);
        }
    }
    translate([20,15,0]){
        rotate([90,0,0]){
            cylinder(3, r = 8,center = true);
        }
    }
    translate([-20,0,0]){
        rotate([90,0,0]){
            cylinder(30, r = 2,center = true);
        }
    }
    translate([20,0,0]){
        rotate([90,0,0]){
            cylinder(30, r = 2,center = true);
        }
    }
}