Last year I took a two day class in flint knapping with a local primitive skills group. I loved it, but as of yet I haven't had the time to sit and practice for any extended amount of time. I have to sneak in time here and there and in between other things.
It's great fun and there's a sense of pride when you produce something that can be used. Of course there's also the frustration when you miscalculate and screw up something that you've been working on.
I hope to get a feel for stones so that I start seeing the angles naturally. Right now, I spend too much of the little time I have, just studying the rock I'm working on. I'd feel better if there was some kind of "Undo". LOL
On the other hand, there's no better teacher than trial and error I guess. I should just bang away...
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"Learn survival skills when your life doesn't depend on it."