OK, stupid question time 
I've seen Ray & co. on TV produce great streams of sparks using a firesteel and the back of a knife. Try as I might, I can't get more than a measly spark or two. I'm using a BG Woodlore clone knife, so clearly I can't blame poor tools for this. A couple of daft questions:
- can I damage the knife by pushing really hard? (I assume not)
- is it possible to use the blade, or will that knacker it? (I assume so)
What's the technique for using a knife as the striker?
TIA, and excuse me asking the bleedin' obvious.
Tobes

I've seen Ray & co. on TV produce great streams of sparks using a firesteel and the back of a knife. Try as I might, I can't get more than a measly spark or two. I'm using a BG Woodlore clone knife, so clearly I can't blame poor tools for this. A couple of daft questions:
- can I damage the knife by pushing really hard? (I assume not)
- is it possible to use the blade, or will that knacker it? (I assume so)
What's the technique for using a knife as the striker?
TIA, and excuse me asking the bleedin' obvious.
Tobes