Pullmax-style power hammer - video

Pullmax-style power hammer. By Garrett O'Dell. 8:13 video:

https://www.youtube.com/watch?v=q0RiTQq4LIA

Parts 2 and 3. By Garrett O'Dell.

7:22 video:
https://www.youtube.com/watch?v=gvo8g4At8u4

5:45 video:
https://www.youtube.com/watch?v=turEUHAHPME