I took a blank piece of paper and as I took pieces off, I very carefully traced around them in a horizontal line. Then I put the paper in a sheet protector. Whenever I change a blade I pull it out and set the pieces on the diagram.
I really like the idea of taking pictures with my phone and just finished doing that and printing them out - one with it together and a second with the pieces on the diagram. I have added them to my original diagram and love it!