Here's a closeup of the LEDs. Their simply mounted with hot glue again. It holds well enough, but can be removed fairly easily, fairly cleanly too.
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Here's the wires going from the front to the back. To get to the other side, I went between the batteries, then back.
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And how I get power from the batteries in the LSF.
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When I take the insulation off the batteries, I'll have to redo part of how the wires are running. Maybe I'll think of a better way by then..