$fa = $preview ? 12 : 4;
$fs = $preview ? 2 : .4;

difference() {
	union() {
		cylinder(d1=4.5, d2=8, h=10.5);
		translate([0,0,10.5]) cylinder(d=8, h=9);
	}
	translate([0,0,-.5]) cylinder(d=3, h=11);
	translate([0,0,10]) cylinder(d=4.5, h=1);
	translate([0,0,10]) cylinder(d=6, h=11);
}