I am planning on buying a HyperFire but they require the D batteries which are huge, heavy, and expensive. And I have NONE. So, I would like to know how to convert an AA to a D without buying other batteries, or buying a converter, just convert one using some household materials and an AA. Also, no electrical tape please because I don't want to waste my last few pieces of it. Might sound like a big request, but I'm sure someone would help me, right?