$fn=20;
h=3.5; // height
w=5; // width
int = w/4; // interhal hole
angle=21.2; // angle in bewween side holes

difference() {
	cylinder(h,r=w);
	cylinder(2.01*h, r=int, center=true);

	for (curr_angle = [0 : angle : 360])
	{
		rotate([0,0,curr_angle])
			translate([0.5 * w, 0 ,h/2])
			rotate([-90,0,0])
			cylinder(d=1,h=w+1);
	}
}