Handwriting Script
You need to follow the instructions in the script. The disk doesn't scale
itself — while that probably could be added to the script, the basic idea was
just to have your path scaled correctly (or scale the initial object yourself).
By using snapshow you get the disk objects and then use the script to hide.
As I said, though, I can't really think why you'd want to use this as using an
opacity map is so much better.