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Here in the Southwest, we use coarse crushed rock as ground cover. Over time this rock is coated with clay due to wind and rain plus it tends to sink into the ground below it. The typical solution is to buy more rock and spread it around. This is costly and back breaking work. This power rake is a proof of concept yet works rather well. The drill drives a shaft with a bar attached to it. The bar swings around and causes the rake's tines to vibrate. This vibration pulverizes the clay and exposes the rock. With only a pulling motion, this rock is moved out of the way. After a few passes I have a pile of clean rock. Some of this rock can be moved back to cover the ground while the rest can be used else ware. Full plans: https://rick.sparber.org/PRRA.pdf.