What vow did Cholkar make to Sai Baba and what personal sacrifice did he undertake when its fulfillment was delayed?

Cholkar, a man from a poor household, depended on passing an examination to make his job salary permanent. According to Chapter 15, he made a firm resolve, vowing that if he passed by Sai Baba's grace, he would visit Shirdi and distribute sugar candy (khadisakhar). His wish was granted, but he faced financial difficulties, described as a difficult "threshold-ghat" (home expenses), which delayed his pilgrimage. As a personal penance for this delay, Cholkar gave up sugar completely. The text in Chapter 15 explicitly states that until the vow to Shirdi was fulfilled, Cholkar avoided sugar as an inedible substance and even drank his tea without it.