Center an engine casing on the CD, and trace around it using a fine point permanent marker.
The molded circles on the CD will help with centering the casing.
I tried to enlarge the center hole too quickly and cracked one of the clear CDs. So I pulled two new CDs and started again.
It's easier to enlarge the center hole by cutting at an angle. Flip over the CD and angle cut from the other side.
The picture shows the blade angle, the blade is up and the handle down.
You'll have to continually check with the casing and motor mount tube to be sure you don't make the hole too large.
A small piece of 220 grit around my finger was used to help round out the hole.
Enlarge the center holes on both CDs to a tight outside diameter fit on the motor mount tube.
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