I recently started experimenting with making a sparklite/ ranger ricks SOS firestarter type thingy out of a disposable lighter. The first time I cut the bottom of the lighter off with just under an inch of the resevoir bit left of. I then took the metal guard off the top, drilled a small hole horizontally through the bottom, to fit a split ring, and there you go, its like ranger ricks flint. At the time, I was quite happy with it, but didn't put it in a kit. But just recently I disided to put together a micro kit similar to Pro Survival kits
"Micro Pro Survival Kit", (I will post the contents of mine another time. None of the flints that I own would fit into this kit: BCB ranger flint, BCB mag/steel, scout firesteel or my ranger rick style one. I had the idea of making an even smaller flint out of a lighter so after a few experiments I came up with this technique. Out of the lighters I tryed, Ronson works best as the plastic is softer.
1. Remove the metal cap
2. Burn off any excess gas
3. Use a junior hacksaw to saw 1/3 of the way through on the join between the black plastic head and the coloured resevoir. Make sure you saw, starting on the side with the push button.
4. Stick a knife/screwdriver/flat bit of metal into the saw gap and twist the knife to open gap. this should snap head of from rest of body. Make sure the shaft with the spring in remains.
5. cut of button, and excess plastic with a sharp knife. Cut of the front part of the head.
You now have a very compact and light weight one handed firestarter. I hope this is interesting. I'm sorry if I didn't explain it very well, and I don't have any pictures.