Homemade power hammer. By Machine shop at the bottom of the garden. 22:49 video:
https://www.youtube.com/watch?v=t-knMZTTUCg
Previously:
https://www.homemadetools.net/forum/...058#post137994
https://www.homemadetools.net/forum/...100#post115522
https://www.homemadetools.net/forum/...1314#post74161
