Les , your idea is marvellous
I may try the same, except maybe slavage a tiny file from a broken nail clipper or broken multitool..etc. and try it instead of a blade. Looks promising , especially - as doughwalkabout said - it can be pressed harder to produce bigger sparks

Doug, I never thought of using the cup as tinder holder. hmmmm
I had to remove them because there were getting in the way.

Anyway, this striker seems only successful with two "tinders" : alcohol swaps, and steel wool. Alcohol swaps are scattered in every FAK and utility kit I have, so that take care of it.

But I will be experimenting with the Les varaiation.
Great idea.

If it works, I may attach one of these to every MT or SAK that has a file, unless the file is stainless steel and won't make sparks. That is another story