Proto One was a junk droid who made his home on Boonta. Discarded after years of service left him in need of repairs, Proto One repaired himself using scrap from the Boonta scrapyard, which he became the proprietor of. Although these repairs allowed him to continue operating, Proto One used a cane to help with mobility and balance.
Source: Star Wars: Droids - “A Race to the Finish” (1985)
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