I have been teaching a survival/primitive skills/outdoors class at my kid’s homeschool co-op for the last 4 years. Sadly unless something major changes I am moving. The Air Force has decided I have been in one place a bit too long. Since this is my last semester to teach I am wanting to give the kids something. I am thinking strikers made from old files and some flint. Two questions from the group. One, do I need to do anything to the old files other than cut them into manageable pieces. I’m going to the local flee market this weekend to see what I can find. Two, what’s the best place to get flint? I have looked a bit online and seen a little out there. Any preferred places? I tried to find it locally but haven’t had much luck.