When using flint rock, I have found it best to use high carbon steel for the striker. The one I use was forged from an old file by a blacksmith but, you can use the back of a high carbon steel knife blade (mora knife) or any other high carbon hardened steel. I also make my own char cloth from any 100% cotton fabric (jeans, old tee shirts). I use a pint paint can with a nail size hole in the lid. The hole in the lid is for the pressure that will build up in the can. I cut the cotton material into 1-2 inch squares and place them in the can, put the lid on the can nice and tight and then put it in my grill. It will begin to smoke from the hole. Let it smoke until the smoke starts to become almost clear, about six minutes, it may take a few test runs to get it right. Make sure the lid does not come off of the can untill you are done otherwise the charcloth will burst into flames. Set the can off to the side and let it cool for about ten minutes. You should have usable char cloth. When I am ready to make a fire, I take a piece of char cloth and fold it in half and put it on top of my flint. I then angle the flint upwards, as if I plan to shave my steel. I strike my steel down in a quick movement like a very wide "v" across my flint. I can get a usable ember in one or two strikes. I couple my char cloth with dryer lint and then blow like no tomorrow and voila!, fire.