$fn=64;

difference() {
    hull() {
        translate([  0,  3, 0]) cylinder(d=1, h=1.2);
        translate([  0, -3, 0]) cylinder(d=1, h=1.2);
        translate([ 20,  3, 0]) cylinder(d=1, h=1.2);
        translate([ 20, -3, 0]) cylinder(d=1, h=1.2);
        translate([ 50,  0, 0]) cylinder(d=0.1, h=1.2);    
    }
    translate([ 5, 0, 0]) cylinder(d=2.5, h=2);
    translate([20, 0, 0]) cylinder(d=2.5, h=2);
}