Kentucky farmer Melbourne D. Florence came up with a simple way to make a tractor-mounted rock digger.

It consists simply of a subsoiler shank mounted backwards on a frame that fits a tractor 3-pt. hitch. The shank is not modified. A heavy piece of angle iron runs across the front of the shank to help anchor it in place.

Florence simply backs up as he lowers the shank into the ground, then lifts when the shank contacts the rock. On a bigger rock, he says you can work your way all around it to rock it loose. It'll dig down as far as a couple feet.