translate( v=[0,0,0.6] ) {
difference() {
	cylinder( r=20,h=1.2,center=true);
	translate( v=[0,5.5,0] ) {
		cylinder( r=13,h=2,center=true);
	}
/*	translate( v=[0,19,0] ) {
		cylinder( r=0.5,h=2,center=true);
	}*/
}
}