Thats exactly what I posted once ( about the firesteels ), but bageera, who sells them told me the technique, and now I find I can get much more sparks from it. Bageera explained that on one side of the metal striker there is a bur which if you strike with, you get a huge shower of sparks. Alternativly you can use a piece of hacksaw blade, but the flint won't last as long. I use the scout firesteel which is smaller and quite a lot cheaper. You can get many more strikes out of it that a mag flint block.
I hope this is helpful