The needle does it all.. you can work every bit of the water column with them and you can even work them like a pencil popper..
I think that the bass think they are a squid, a giant sand eel, a small needle fish and this always raises eyebrows, but i am convinced that they really imitate a swimming razor clam.
check out the first few seconds of this... IDENTICAL action..
Razor clam peruvian swimming - YouTube