Step 3: Punch some holes draw more guidelines and thread some string
Do the same at the other end of the line.
Now flip your disc over and draw another +. It needs to be aligned with the one on the other side. Use the holes to help you position the first line, find it's midpoint and then draw another line at 90 degrees.
Thread a length of string through each hole and tie it on securely.
Alternatively you can use rubber bands or elastic. I did this because you don't have to continually twist the disc, you can just wind it up and let it go.