How do you remove the key cylinder from the ignition switch on a 1965 Chevy?

Notice a very small hole in the chrome face of the key cylinder, insert the key and turn to the ignition on position, insert a paper clip or similar object into the small hole and gently push in as you turn the key to the start position. This will release the cylinder and allow you to pull it straight out. Disconnect the negative battery post before you try this.

The above answer is wrong!

Put ignition key into cylinder, turn the cylinder as far counter clock wise as possible.

Install a straightened paper clip into the small hole on the chrome face of the key cylinder. Push the paper clip into the cylinder. (You will feel as "SPRING LOAD")

Keep pressure against the spring load & turn cylinder slightly some more counter clock wise. While holding counter clock wise pressure remove the paper clip & turn cylinder counter clock wise until it will go no furthur. At this point pull the ignition cylinder out. BINGO!