Been a while since I've been over here. Being the author and a practicioner of flint and steel, I disagree that knives will not make good strikers. I did a lot of research on this before I wrote the article and there are a lot of makers making good carbon steel knives that have enough hardness to produce sparks as good as a C-steel. In fact there are makers making knives specifically for this purpose - research Dan Winkler's knives from NC, or the Laser Srtike knife that TOPS built for us many moons ago. I will agree that most factory knives don't work as steels, but to say all knives won't work is absolutley not true.
Also, if its taking muscle for you to get a spark with flint and steel, make sure you break your flint to expose a sharp edge and play with the angle you're striking. Flint and steel takes very little work to produce sparks good enough to catch in char, true tinder fungus or fine steel wool.
Jeff
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