According to the source text, what specific methods did Sai Baba employ to guide his devotees toward realizing the formless (Nirguna) reality?

Chapter 11 of the Sai Satcharitra reveals that Sai Baba used a variety of methods to help his devotees realize the Nirguna, or the formless aspect of the divine. These techniques were customized based on the devotee's spiritual eligibility. The chapter provides several examples, such as sending a devotee to another country, confining someone to solitude in Shirdi, locking a person in the Wada, or assigning them the task of reading scriptures. As explained in Chapter 11, by engaging in these practices over many years, the devotees' longing for the Nirguna would grow stronger. This process would keep their minds constantly occupied with Baba's spiritual company, helping them transcend the focus on the perishable body and connect with the eternal.