I know that on my older M-B's a sticking ignition tumbler is an impending disaster. What about the E53?

My ignition switch frequently needs some real fiddling to get it to rotate, and not related to steering wheel position. Is this something I need to tackle immediately before I get screwed with an expensive situation? Simply a tumbler, or is there more to it?

thanks

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Chief

2004 3.0 6 speed manual