Peter,

Thank you very much for answering my questions. From what you tell me, I think my friend's 300D has a slightly jammed steering rather than a broken tumbler. It is because when the steering wheel is not in the locked position after the key is removed, the tumbler had no problem starting the engine next time. If the steering wheel is locked, I have to move the wheel back and forth while turning the key (as Steve019 stated). Do you agree with me or you have a different opinion?

David