eps = 0.01;
infty = 100;

inner_d = 11.7;
outer_d = 16;
body_h = 1.5;
tip_h = 3;
tip_w1 = 5;
tip_w2 = 0.5;
tip_d = outer_d/2-0.5;

difference() {
	union() {
		cylinder(r = outer_d/2, h = body_h);
		hull() {
			translate([0, -tip_w1/2, 0])
				cube([tip_d, tip_w1, body_h]);
			translate([0, -tip_w2/2, tip_h - eps])
				cube([tip_d, tip_w2, eps]);
		}
	};
	// inner hole
	translate([0, 0, -eps])
		cylinder(r = inner_d/2, h = tip_h + 2*eps);
	// rear side
	translate([0, 0, -eps])
		rotate([0, 0, 135])
		cube(infty);
}