Having trouble getting a light? Unload the spring on the flint and jiggle it. It tends to get burnished and needs a fresh edge.
I realize this may be very obvious to some of you!
Corona produces a flint. Its a bit softer. It may be your answer. They are available from a couple of the online retailers. I added them yo a tobacco order a while back. I think they come 5 or so to a pack.
Mike S.