I was talking to a guy at work who said he done this on High Rock Lake here in central NC. Start out by taking a 10' section of 3/4" pvc pipe and run 12-14' length of rope or twine through the pipe. On one end tie a 7/0 treble hook and the other end tie on a large washer. Go out on the lake and cruise around looking for concrete boat ramps going into the water. Get in the water and feel along the edges of the ramp until you find a hole going up under it. Pull the hook up to the pipe and run the pipe into the hole and when you feel something hit it snatch back and the pipe becomes a fishing rod. He said that the fish would bite down on the pipe, trying to protect it's territory I guess. He showed me some pics on his phone of three flatheads they caught, a 15lb, 18lb, and a 38lb one.