Please, help! I have a '74 Chevy Cheyenne Super 4WD truck, that I'm trying to replace the ignition key switch on. I've got the steering wheel off, and am down to where I should be able to remove the old switch, but I can't figure out how to release it. I bought the new one, but the directions aren't very clear about removing the old part. Any helpful info would be welcomed! Thanks!