Chinese axe head power hammer.
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Previously:
https://www.homemadetools.net/forum/...598#post162794
https://www.homemadetools.net/forum/...058#post137994
https://www.homemadetools.net/forum/...100#post115522
https://www.homemadetools.net/forum/...6821#post84414
https://www.homemadetools.net/forum/...1314#post74161