By John Kelly, The Washington Post A razor-sharp chisel in hand, Zev Zalman “Z.Z.” Ludwick leans into the violin he is making and shaves off a sliver of wood. It curls up, a simulacrum of the Hasidic curls — payot — that hang on either side of his bearded face. Classical music plays over the radio in the basement workshop of his Silver Spring, Maryland, home.