You'd better watch it

Today I went to replace the battery for my watch. I tried a ludicrously expensive shop on Queen's Road first, who sent me down the street to King's, a tiny shop full of watches, and a very old man almost completely hidden behind a stack of boxes. The salesman directed me to him, yelled a bit in Cantonese and then the aged man put on what looked like an Alice band made from pipe cleaners and elastic.