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I had built a stand out of 2x4's and plywood I had and bolted it to it.
Drilled a hole in the top so the hammer could fit in it.
Had a vinyl cover over it to keep weather off.
The plywood would had disintegrated quickly in sun/rain otherwise.
The biggest problem with a stump, is cutting it square with a chain saw. And if its not level, the pounding wears on the lag bolts holding it to the stump.
There's gotta be some kind of jig that can help square off the stump ?