Window Punching: The spark plug principle?
I was wondering if anyone could explain to me how the whole sparkplug to smash a window thing works? I have heard it's suggestion as an alternative to a centre-punch, but I cannot get my mind around it. I have seen the youtube videos that scum-rats post about those 'ninja rocks', aka broken pieces of ceramic, but I have a strong doubt that is what people are referring to. Not to mention it would be dangerous to add more projectiles to the scene.
Is it the ceramic that does the breaking, or is it the concentration of force? For those that use them professionally, is it the electrode that you use, or what? I mean, the last extrication I was on, I saw a Halligan bounce clean off the window lol... Nobody had a punch on them, and whilst I had the excuse of being new, I should be prepared for the next one!
I ask because, being the cheap b****rd that I am, I may replace my spark plugs soon, and when I do if there is legitimacy to it's use in FFing, then I may save the old ones... Why buy something when you can get comparable free lol...
If you'd rather PM me the answers, I don't mind that at all, in a small attempt to hopefully keep the information out of the wrong hands!