That's classic RTFM material right there...at least you didn't
RickRoll him.
Old
thread but its 1am..... Yes I want to do the same. I need one tired of my AA explosions when I drop it
Expanding on what tmassey said, my first mod was a Puck in an Altoids tin with a 4xAAA box inside. I know you said AA, but for shock resistance it may be worth the change. I attached it using Velcro, a piece the same size of the box (My first thoughts were to be able to switch the box between
devices). On the front is a piece of adhesive rubber strip (makes the box contact the lid of the tin to null travel when using the on/off switch). The hot glue around the wiring is obvious.
This trio of unintentional safeguards made the tin very tough. I've dropped it numerous times with no damage save scratches and minor dents.

Please excuse the ugliness of my switch hole, I used a 1/4" drill bit and a round file, the only tools on hand at the time.
Of course the AA option is still viable if you went with a larger enclosure, but much bigger than the tin starts getting awkward to hold.