Such jobs done by the shop keepers are very minor/petty in nature, and the shop keeper hesitates and feel low to take any sum for the job done. I had been to many shops viz. to tighten up the screws of my spects, to adjust my wrist watch chain, to lubricate some parts of my bike, for which the shop keepers never charged. They just smile, and if I try to offer some sum, they would say - " It is alright. Nothing required."
Remember, Such shop keepers will not hesitate to take a good sum when we visit them next time, and we won't be able to bargain, but pay the sum demanded. We would feel low if we try to bargain with the same shopkeeper.
No life without Sun