$fn=90;

SW=14;

difference() {
	union() {
		rotate([0,0,30]) cylinder(r=SW/sqrt(3), h=8, $fn=6);
		mirror([0,0,1]) {
			cylinder(d=16, h=12);
			for(i=[0:360/36:359]) rotate([0,0,i]) translate([8,0,0]) cylinder(d=2, h=12, $fn=4);
		}
	}
	cylinder(d=9, h=40, center=true);
}