Originally Posted by Sandra L
I believe the little wheels go in a track on either side of the rail. If you were to look from the inside, you'd see the wheels from the side (the diameter view) and they roll in the track. There is a track on each side. When installed you'll only view one wheel as the other is on the other side. (If you are short.) In order to install, one needs to remove (by unscrewing) the blocking gizmo at one of the ends of the track and slide the wheels in the track, one by one. The gizmo is replaced and the curtain can be hung. The hole at the top of the curtain can go over the hanging hook part. It actually is harder to describe than do.
This makes perfect sense! I only looked from one side so could only see one track. It makes sense there are tracks on either side of the rail for the wheels. I thought it was like a closet with a wheel track on one side. Thanks, SandraL!