We've gone this thread several times that I've been here. Some locks just adore them, some done so much. I love them myself. Just received 2 dozen in the mail box myself with another 3/4 doz. or so on their way but a bit larger for my old Siler. I should try an old chunk of quartz - dang thing doesn't need a flint with an edge, sparks anyway. I wonder how that Carboloy flint will work?