Quoted from JeffZee:I think it's fun to make at least some effort to keep the electronics looking original. I use remote battery packs. But instead of rewiring anything, I use 1/2" dowel to make battery place holders. If the outer two battery holders are in good shape, it's plug-n-play. The picture is from a system 11. Don't know if WPC is the same orientation. I think there's a commercial version of this idea made from molded plastic.
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Upvoted for the cat playing with it!