The ignition key has locked up in my 1997 Chevy S 10 5 speed manual transmission. I tried turning the steering wheel back and forth,jiggled the key and tried different keys with no luck. I cleaned the lock with alchol and naptha then lubed it lightly with graphite. Still no luck. So I decided the tumbler lock was bad and needed replaced. I bought a new lock and went to work disassembling the steering column. Once everything was disassembled and I could get to the releasing hole on top of the tumbler I realized I cannot replace the tumbler lock because I cannot turn the key to the start position to release it. Can anyone tell me how to proceed?