What was the specific vow Cholkar made, and how did he observe it before visiting Shirdi?

The story of Cholkar highlights his dedication despite worldly troubles, which are described as a "threshold-ghat" that is difficult to cross. Until he could fulfill his vow to visit Shirdi, Cholkar committed to abstaining from sugar. As detailed in Chapter 15, he took this so seriously that he considered sugar an "inedible substance" and even drank his daily tea without any sugar. He maintained this personal sacrifice for some time before he was finally able to make the journey to see Sai Baba and complete his promised offering.