I test each one and they are reliable. As for old I run that same route three or four times a week so they've only been there a day or two. The original tic tac kit I built for an adventure junkie held one and sparked three fires in the jungle with no problem. Why destroy a perfectly good lighter with lots of guaranteed flame to get a spark device? That's a Ranger Rick trick I simply do not agree with. Thanks for the question Stephen.
Where do you run and find discarded lighters on such a regular basis? I am lucky to see maybe 1-2 discarded/lost lighters per year even in a large metro area. Even then it is not worth the hassle, time nor chance to rely on a found lighter of questionable provenance to use in an urban or wilderness PSK...
_________________________
Earth and sky, woods and fields, lakes and rivers, the mountain and the sea, are excellent schoolmasters, and teach some of us more than we can ever learn from books.
John Lubbock