David,

"Have you tried using the tweezers as a striker? Got the idea from an early issue of Tactical Knives"

I have not tried that. I would imagine it might work, but be pretty frustrating- using the sides of the tweezers is going to be awkward since they're so thin and flexible, and using the ends may tend to ruin them for their normal use, eventually... and there's the fact that they seem to get lost a lot. Seems like it would be frustrating to have much better tools right in your hand that you can't use for this..

I do know that a P-38 can opener works very well as a striker, and that's why I don't put a separate one in my PSKs. Given the way that ferrocerium works (as opposed to real flint), I'm sure that glass or anything hard and reasonably sharp will work fine.