If you still find them under the boat docks you can hold the jig in your hand pulling back on the line bending the rod and when you let go it will shoot under the dock. Then you can let it fall or swim it back slow, but you must become a line watcher and any tick movement you see set the hook. It's called shooting docks and would be better if you see it in a DVD like Ernest Paty's video.
There may well be others with the same info, but this one I have seen and own.
Hope this helps,
Skip
http://www.catchcrappie.com/video.asp