Below are comments by two reknowned fishermen in response to the question, "What makes a Corky work?":

The Corky should be worked very slowly. This bait has an uncanny ability to suspend. When twitched, the corky will dart like an injured baitfish. Let the bait have long rests after each twitch. Do not be afraid to let it sit. The Corky often does its best work when left alone.
When fishing from the boat try pressing a finishing nail or wire into the nose for added dive.
Remember, the Corky was created to be tinkered with. Try adjusting the nose and tail with subtle bend. Just remember that a little tune goes a long way.

Pat Murray

Most important are the soft plastic and weight to size ratio. They make a lure that I can fish very slow & stop without sinking too fast. I can fish it almost on top by bending the tail up or deeper by bending it down. Some times I add about 3/4" of #14 copper wire to the belly to go even deeper. I think fish are like people, they want something good to eat and easy to get. The second most important are the eyes. You have put the best eyes I know of on this bait. The eyes always stand out-look at fish pictures.
The painting on these baits is the best. You have many great colors... Good hooks are a must on any lure and yours are the best.
The above could not be achieved without expert worksmanship & supervision in manufacturing and you are the most capable person I know of to make lures

Pete Tanner

Sinker

One method of making a Corky sink is to add some weight to it. Take about 1/2" of wire and insert it into the head of the Corky, just beneath the wire, as shown above. Vary the gauge of wire and length to experiment with different diving speeds.

Sink by bending:

One more method of making the Corky sink is by bending the tail. If the tail is bent down, the Corky will sink as it is pulled through the water. Bending the tail just a little bit will provide more than enough sink, but feel free to experiment.

***Over Bending will cause a Corky to spin

Rise by bending:

A common method of making the Corky rise to the top is to bend the tail slightly. When the tail is bent up the Corky will rise towards the surface when pulled through the water. Remember, just a little bit goes a long way, so don't bend it too much.