Make another copy of the corner cylinder and scale it up twice by pressing 
, then snap it into place on top of the center of the box.
Duplicate the top ellipse and scale it down to 50 percent in place (
). After that, you don’t even need to move it anywhere—it is already precisely where it must be to imitate the hole in the top cylinder. All you need to do to make it look like a hole is add a horizontal linear gradient whose direction is opposite to that of the cylinder. While you’re at it, make three more copies of the hole, snap each one into the corners of the base box, and scale down by pressing again—these will be the holes for the bolts to fasten our detail in place:
