Can you describe the incident involving Sai Maharaj and a wooden plank mentioned in the introduction?

Certainly. The introduction in Chapter 0 recounts that the Masjid where Maharaj resided was in a dilapidated state. A devotee, Nanasaheb Dengle, provided a thick wooden plank for Maharaj to sleep on, rather than the dusty ground. However, Maharaj used it unconventionally by hanging it from the rafters with old rags and sleeping on it. The text notes that these rags seemed too weak to bear the weight of the plank, let alone Maharaj's body, but did so due to his power. This spectacle drew crowds, but since it became a distraction, Maharaj eventually broke the plank.