What specific methods did Sai Baba employ to guide his devotees from attachment to his physical form towards the realization of the formless (Nirguna)?

Chapter 11 of the Sai Satcharitra details the countless means Baba used to help devotees realize the Nirguna based on their spiritual eligibility. To foster a longing for the unmanifest, he would sometimes keep them at a distance or even forbid them from seeing him for long periods. The chapter mentions specific methods, including sending a devotee to another country, confining another to solitude in Shirdi, locking someone in the Wada, or assigning them the task of reading scriptures. By practicing these disciplines, the devotee's mind would become constantly occupied with Baba's essence, transcending his physical presence.