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I reached out on Freecycle asking for old unwanted battery-operated toy cars. Limpy is one of those cars, plus lots of hot glue and craft sticks and paperclips. I used this Youtube video as a guide: https://youtu.be/HKKZyEMJOCU Video of Limpy: https://youtu.be/20AGmSqZx4k
This is a companion discussion topic for the original entry at https://community.robotshop.com/index.php/robots/show/limpy-the-super-simple-walking-robot