prototype hammer jpg
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Mounted this one in a different (dumb?) way. I profiled the wood to match the hourglass of the hammerhead, the saw cuts allow the "too big" end to fit through the head, then I put a big screw right in the middle of the four quadrants to act as a key/wedge. 
It's not as rigid as a normal handle (especially torsionally), but it doesn't seem like the head will fall off. Will update if it flies off and breaks something. 

 >>/63253/
belly