Step 1: Make an adapter from paper and glue
Step 2: Finish the paper roll
Get a thin brass rod or a short piece of #10 bare copper wire. Drill a small hole in the center of the wooden plug and press the copper or brass piece into the hole.
Place the roll over an AAA battery. File the brass or copper piece until the length of the AAA battery with the paper adapter is the same length as an AA battery.