I have a saw that I would like to re-cut the teeth in some day. It's a 7 tooth rip that I would like to make more aggressive. 4 or 5 tooth. For some reason, I never see these at yard-sales and such, always higher tooth and mostly crosscuts. I don't wish to spend more than $5 dollars for these old rusty things as I hate cleaning them up. Not my thing.
I can't imagine using files to do this when it seems like a Dremel with an abrasive cutting wheel would get this done in no time. Yet, I don't see any information to support my theory.