I had read somewhere about putting each line of a charted pattern repeat on index cards, punching a hole in a corner and attaching a key ring. Then I promptly forgot about it.
This past weekend, I was in Joann's and saw a pack of 20 tags-- already holed punch and reinforced! So, I made this for my Convertable pattern. I can flip a card over when I'm done, and I put the symbol legend on the back of the top card (sometimes I forget what the symbol means!) I'm using a large bobby pin to hold the cards together.