long=20;
large=20;
manche=50;
haut=5;
$fn=60;

difference(){
	union(){
		cube([long-1,large,haut],center=true);
		translate([-0.5*manche,0,-0.25*haut]){
			cube([manche,haut,0.5*haut],center=true);
		}

		rotate([0,-90,0])
		cylinder(r=0.5*haut,h=manche);
	}

	rotate([0,5,0]){
		translate([10,0,2]){
			cube([long+50,large+20,1.2*haut],center=true);
		}
	}
}

translate([-manche,0,0]){
	sphere(d=haut);
}