I have recently been using the back side of a Fallkniven F1 and it has worked very well. Lit up cedar bark on the second strike on my most recent attempt and I'm no Firesteel expert either...trust me. <img src="/images/graemlins/smile.gif" alt="" /> The F1 has a nice sharp 90* angle on the back so I asume any blade with the same characteristic would perform similarly.