Yesterday i finally maked some charred cloth  (denim jeans cotton fabric) to use it as a firestarter with some kind of sparkling device... It works great!! very easy to get  a nice ember with the sparks of any flint lighter (zippo, clipper etc)  then i just placed the embered charred cloth on a tinder nest, blowed it gently and i got flames in a short time
I like clipper's flint/steel module, it's tiny and very easy to replace flint when worn out... flints are also tiny and cheap (3 cents of euro each) they come in a little container of 10 flints and that is zillions and zillions of spark showers.
Today i will try to light one of those charred cloth bits with a magnifier (if it's not too cloudy) I'll try to post some pics of the clipper  lighter's sparkling module