You live in the center of osage country......
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if I were you I'd probably wouldn't touch anything but yeller wood.
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Nice job, I like to round my edges a bit more,gives less of a place to pull a splinter along the edge of the limb, also in the grip area where its mostly just for comfort and esthetic's. All and all a great job for your first though. Looks like you nailed the tiller.
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