It sounds like you may have more of a problem than the lock cylinder, (the actual ignition switch is lower down on the steering column) it happened to me the same way you describe. It turned out to be a horshoe looking thingy. And has been a common problem on tilt steering wheels. You will have to remove the steering wheel and the turn signal switch inside the column. It can be kinda tedious but if you are mechanically inclined and have the tools you can do it. Wish I could be of more help. If you were a local I'd fix it for free for you. Good luck.