Could you provide a summary of the key devotees of Sai Baba mentioned in the text and their service?

The provided text highlights several key devotees and their service to Sai Baba. Chapter 0 introduces Nanasaheb Nimonkar, an Honorary Magistrate who spent his last three years in constant, tireless service to Maharaj, who called him "Kaka." He passed away shortly after Maharaj, constantly seeing and addressing everyone as Sai Baba. Another devotee is Damu Shet Kasar, who, after being blessed with a son by Maharaj, established a lasting tradition of bringing a ceremonial flag and feeding fakirs during the Ram Navami fair. Lastly, the text briefly introduces Nanasaheb Chandorkar as another selfless devotee from Kalyan who was drawn to Maharaj.