Can you share some specific examples from Chapter 33 where Udi was used to cure people's ailments?

Certainly. Chapter 33 provides several powerful anecdotes about the healing power of Udi, particularly in a footnote by R. Hari Sitaram Dixit. One story is about Khimji Lalji Joshi's daughter, who was so weak she couldn't walk. After Sai Baba applied Udi, she began walking within a few days. Another case involves Dixit's friend who suffered from insomnia for eight days; after taking Udi for just one night, he slept soundly. A similar story tells of a child from Bandra who had been unable to sleep for two months but got sleep the very night he was taken for Baba's Darshan in Shirdi.