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Really nice. I've been looking for something like this. I have a large rock or should I say boulder that I wanted to build a fire pit in it. It measures about 6' across and is about 30" thick. It takes a backhoe to move it. I might try this method. The only issue that I might have is that it is chert, very similar to flint hard as hell. We shall see. Who knows, maybe I do an Instructable about that effort.
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