Titanium hammer. By Timothy Dyck. 28:50 video:
https://www.youtube.com/watch?v=KPzTPlF6Cp4
Previously:
https://www.homemadetools.net/forum/...023#post145073
https://www.homemadetools.net/forum/...081#post138069
https://www.homemadetools.net/forum/...968#post100346
https://www.homemadetools.net/forum/...2847#post97293
https://www.homemadetools.net/forum/...354#post116580