What was the specific vow Cholkar made regarding Sai Baba, and how did he finally fulfill it in Shirdi?

The story of Cholkar highlights a vow he made to Sai Baba. Facing worldly difficulties described as a "threshold-ghat" (home expenses) that were hard to cross, he vowed to abstain from sugar until he could visit Shirdi. As detailed in Chapter 15, Cholkar was so committed that he even drank his tea without sugar during this period. When he finally managed to travel to Shirdi, he fulfilled his promise. Upon having Sai Baba's darshan, he prostrated at Baba's feet, distributed sugar with a pure heart, offered a coconut, and declared that all his desires had been fulfilled.