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What I want to know is, why would you need to split large branches length-ways? I've never run into any pieces of tree that I could not stomp and break, or wrench off a tree. Ive used a knife to make small "v" cuts in the base of large branches I snap off by hand, but I don't like to let the knife go more than an inch or so deep in the wood. If something is too large to manage with this method, this is simply something you'd need an axe for.
Am I doing it wrong?
Also, when batoning, the friction across the blade surface is seems immense! Shouldn't you at least lubricate the knife if you're going to do this? I just don't understand why it would ever be needed.