Apply Edit Mesh modifier. Go to sub object Vertex in Selection roll out, and select the center vertex on top of the Cylinder. Now scroll down to Edit Geometry roll out, and with center vertex selected press Chamfer button, set value to 9. Now do the same thing for center vertex on the bottom of cylinder.

Now scroll down to Edit Geometry roll out, and with center vertex selected press Chamfer button, set value to 9. Now do the same thing for center vertex on the bottom of cylinder