What was the specific vow Cholkar made, and what personal sacrifice did he undertake when he couldn't fulfill it immediately?

Cholkar's story in Chapter 15 describes a very specific arrangement with Baba. To secure his job by passing an examination, Cholkar made a firm resolve that he would present himself at Baba's feet and "distribute sugar candy (khadisakhar)" in Baba's name upon succeeding. However, due to his poor household and the difficulty of crossing the "threshold-ghat" of home expenses, he could not immediately travel to Shirdi. As a personal act of penance for this delay, the text states that "Cholkar avoided sugar as an inedible substance, And even drank his tea without sugar" until the vow was finally fulfilled. This demonstrated the depth of his devotion beyond the initial promise.