Kent Mikolite, the proprietor of this Jewelers Row shop, is one of only two people in the city certified as a master watchmaker by the American Watchmakers-Clockmakers Institute. Rolex chronographs, Vulcain Crickets with mechanical alarms, ultrahigh-­frequency Bulova Precisionists—he knows them all. Mikolite charges $600 or so for the typical Rolex repair—including an inside-out, ultrasonic cleaning—but if the fix is simple, he may do it on the spot for free.