There is a current thread on this on the misc.survivalism newsgroup. Try these links too (looks like good stuff!):<br><br> http://onagocag.com/piston.html<br><br> http://lynx.dac.neu.edu/m/mbennett/friction.html#fire_piston<br><br> http://www.algonet.se/~parlei/psg/fire.html<br><br> <br><br>