Anyway, I emailed everyone (I hope) a correction. But just in case:
The error is in Step 1, the picture and the written words are in disagreement. The picture is right, the scored lines should be on 10" and 11."
When it becomes available on the Scor-Pal site, it will be correct. In the meantime, please make the notation of the change.
I apologize for the error.