That's a nice invention there! You have got a lot of my favorite things packed into a small package with zero fat!

Have you thought about somehow incorporating a ferro rod that's about 3/16" x 2.5"?
http://firesteel.com/products/FireSteel-Pup.html
I'm confident I can start a fire in many conditions with that size. I'm not so sure about 3/8" x 1".
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If you're reading this, it's too late.