Can you recount the story of Kaka Mahajani's friend who was skeptical about visiting Shirdi?

Certainly. A friend of Kaka Mahajani, who was a great devotee of the formless and averse to idol worship, agreed to visit Shirdi out of clinical curiosity. As described in Chapter 35, he set two conditions: he would not bow his head to the saint, and he would not offer any Dakshina. Upon arriving at the mosque, Sai Baba saw him from a distance and spoke in a tone that perfectly imitated the friend's deceased father. This deeply moving experience caused the friend to be astonished, melt inside, and spontaneously bow at Baba's feet, completely forgetting his prior resolve.