On the subject of rulers:
Fons and Porter had a hint on their show to keep instructions for specialty rulers in a notebook so they would not get lost. (Imagine that in our NEATLY organized sewing rooms!!! :-)
This would also be a good place to make a note about the ruler that measures a bit differently from the others.
(No, I'm not that organized, but am working on it. Have a note book on charts and techniques that is almost organized.)