Well, climber, the original striker has a flint scratching against a "round file" as they call it. It is a coiled wire, or should we say : something just like the thread of a screw .

So, from the ideas of our friends I thought, why to remove the flint from its aluminum holder ? why not use the holder to screw it in a an eye bolt, an then use the thread of another eye bolt to scratch the flint against ?

So, it may seem, you need to have TWO flint-eye-bolts in yor keyring. When you need to use, remove one of them and scratch the flint against the thread of the other. Theoretically it should work.

Having said that, I am dying to see how our friends' setups look like.