What specific practice did the Patil from Chapter 13 initiate to express his gratitude to Sai Baba, and what did it involve?

Overwhelmed with gratitude after being miraculously cured of his disease, the Patil sought a way to express his devotion. Chapter 13 explains that Sainath desires nothing more than faith, total surrender, and gratitude. To embody this, the Patil started a new tradition called the "Satya-Sai vow," modeled after the well-known Satyanarayan vow. As detailed in Chapter 13, the Patil would perform this vow every Thursday after bathing. Instead of the traditional Satyanarayan story, he would read the three chapters dedicated to Sainath from Das Ganu's book, the "Bhaktalilamrut." This practice brought him "boundless happiness" and became a custom in his village.