It is not by choice, and he keeps his feet fairly clean. But I noticed that toe nails are essential for pulling the crown sometimes.Many watchmakers in Beijing's Panjiayuan (a famous second-hand market) wouldn't believe when I told them about this guy, that's why I took the pictures to show them. And in some areas, he is well heard-of.I am almost proud to have my watches overhauled by him, it's always a marvel to watch him work, the admission to his performance itself is priceless.