How do you change igintion switch in 74 Volkswagen beetle?

These ignition switches have a spring retainer It is approximately 1 inch back from the face of the lock. It should be in align with either the top of the key slot or the bottom of the key slot. You will have to drill a small hole through the aluminum casting around the lock cylinder I recommend about 1/8th inch. Once you have located the spring it will be black, push it down the key switch will pull straight out. If you have a new switch you can compare for distance, and location. Hope this helps.