Four-sided hammer. Not really sure why.
<video controls autoplay loop>
<source src="https://s3-us-west-1.amazonaws.com/hmt-forum/four_sided_hammer.mp4" type="video/mp4">
Your browser does not support the video tag.
</video>
Previously:
https://www.homemadetools.net/forum/...551#post132369
https://www.homemadetools.net/forum/...256#post126638
https://www.homemadetools.net/forum/...911#post124702
https://www.homemadetools.net/forum/...489#post117099
https://www.homemadetools.net/forum/...6425#post83639