module whorl(
        r_out,
        r_stick,
        t_hub=4,
        t_rim=10,
        h=4,
        h_hub=15,
        h_rim=8,
        r_screw=1.6,
        h_screw=11,
        screw_holes=[90, 270],
        r_latch=2,
        latches=[0, 60, 120, 180, 240, 300],
        ) {
    difference() {
        union() {
            cylinder(r=r_out, h=h);
            cylinder(r=r_stick + t_hub, h=h_hub);
            difference() {
                cylinder(r=r_out, h=h_rim);
                translate([0, 0, -1]) cylinder(r=r_out - t_rim, h=h_rim + 2);
            }
        }
        translate([0, 0, -1]) cylinder(r=r_stick, h=h_hub + 2);
        for(i=screw_holes) {
            rotate([0, 0, i]) translate([0, 0, h_screw]) rotate([0, -90, 0])
                cylinder(r=r_screw, h=r_stick + t_hub + 2, $fn=16);
        }
        for(i=latches) {
            rotate([0, 0, i]) translate([r_out, 0, -1])
                cylinder(r=r_latch, h=h_rim + 2);
        }
    }
}