Reciprocating spader attachment - GIF and video

[Jon]

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.

Very similar to a previously-posted reciprocating turf aerator.

Previously:

Unique manual shovel/tiller - GIF
Turf aerator GIF