infty = 100;
eps = 0.01;

pin_d = 6.6;
pin_d2 = 8.5;
pin_h = 10;

out_d = 11;
wall = 1;

slot_w = 0.6;
slot_h = pin_h;
slot_angle = 45;

difference() {
	union() {
		cylinder(r = out_d/2, h = pin_h);
		for (angle = [0:15:360]) rotate([0, 0, angle])
			translate([out_d/2, 0, 0])
				cylinder(r = 0.9, $fn = 3, h = pin_h);
		// +-90 degree protrusions
		for (angle = [90,270]) rotate([0, 0, angle])
			translate([out_d/2, 0, 0])
			rotate([0, 0, 45])
				cylinder(r = 1.5, $fn = 4, h = pin_h);
		// center protrusion
		difference() {
			translate([out_d/2, 0, 0])
				cylinder(r = 2.5, $fn = 3, h = pin_h);
			translate([0, 0, 2*pin_h/3 - wall/2])
				cylinder(r = infty, h = wall);
			translate([0, 0, pin_h/3 - wall/2])
				cylinder(r = infty, h = wall);
		}
		// bottom cylinder
		cylinder(r = out_d/2 + 0.9, h = wall, $fn = 360/15);
		// top cylinder
		translate([0, 0, pin_h - wall])
		cylinder(r = out_d/2 + 0.9, h = wall, $fn = 360/15);
	}
	difference() {
		translate([0, 0, -eps])
			cylinder(r = pin_d/2, h = infty, $fn = 32);
		rotate([0, 0, slot_angle])
		translate([-pin_d/2-eps, -slot_w/2, 0])
			cube([pin_d+2*eps, slot_w, slot_h-eps]);
	}
}