AA cells can be installed in a socket of larger diameter than itself, if you wrap it in several layers of paper, foam or any other available material suitable for this purpose. For example, a galvanic cell AAA can be installed in a standard socket AA.
If the length of the socket is greater than the length of a galvanic cell between their respective contacts should be inserted in a folded several times a piece of aluminum foil.
Recommend to read
OF THE SATELLITES — TANDEM
Description a three-wheeled tandem, published in the journal (№3, 1979), I liked inherent in it the idea to tandem bike of the usual single, without making major changes to the original...
THE STORM “FIATS”
Soviet istrebitel-polutoraplan-15. In the early 30-ies of the last century in accordance with the existing at that period, the concept involving joint use maneuverable fighter biplanes...