Reciprocating spader attachment - GIF and video
Reciprocating spader attachment. Traditionally used to break up a layer of hardpan, but also useful for making your dog jealous, or to spank six misbehaving toddlers at once.
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https://www.youtube.com/watch?v=vkMkWL5V_Zs
Very similar to a previously-posted reciprocating turf aerator.
Previously:
https://www.homemadetools.net/forum/...2951#post97621
https://www.homemadetools.net/forum/...8885#post88257