Take a small piece of thin plywood that just fits in the bottom of the reinforced BA-48 box and mount three D cell holders. Wire the D cell holders in parallel.
    This is the fabricated cover that sits on top of the D cells. The holes make the pack lighter for those long hikes on the field exercises. Plus you can play peek-a-boo with the D cells.

     The D cell pack and the "painted" cover.
    Fabricate your 9 volt battery tray out of light aluminum sheet. If you do not have a small sheet metal brake then use a a vice and clamp the metal between two pieces of wood.



  Half inch oak blocks form the ends.

   Secure the ends with wood screws.
    Holes were drilled in the sides to make the assembly lighter.
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