The hammer was in need of repair after the test against the tactical vest.
Since the throwing knives went through the vest with ease, I decided to try one as a spike on the hammer.
I changed the threaded bolt from 10mm to 12mm, and bought some tubular threaded stainless steel nuts (50mm length). Then I welded both a stainless steel spike and one of the knife blades to the nuts.
Now I can quickly interchange them, preparing it for the job at hand (human aggressor or undead monster).
I also made the spike far more pointy for better penetration.