I'm going to try and fix my sticking ignition switch. The problem is only when turning the key, inserting and removing is not an aissue. From what I have found from the archive there's an interaction between the ignition switch and the tumbler that might cause the problem. 1st question: What is a tumbler, what does it do? 2nd question: Can I get access to the ignition switch and tumbler just by removing the lower steering column cover, or do I have to remove the steering wheel as well?