Take it from me it’s going to happen when you least expect it too ! Do it now ! Mine showed no signs at all of sticking or getting stuck, 29K miles on her ! Now that’s it’s fixed can’t beleive how easy it turns , like a knife going thru soft butter ! Key has never turned this easy !

Ed, what year is your car? I’ve read that this issue affects 04-06 models. Does this happen on the 07&08 models too?

Yes mine is a 04 , but yet when you order a new ignition housing they still have the spring & pin ? Why ?

If you ordered the old part number you may get an old part, sometimes you are told the new relevant number. I am sure that the later cars were fitted with a part with different number. A very similar number but a different one. Mercedes altered the part number according to its revisions., I believe the numbers changed would be the 4th and 3rd from the end. I’ll check the part numbers for the 2004 and 2007 years and compare.

Yup me to , then stuck in parking lot !!! LOL

I listen and learn from you all the time, my advice is to do it now as well; the older you get the harder it is to get under the dash and do the job.
I learned that it is easier for a fit sixty year old to get in the trunk and put the five trunk panels into place than a man in his late seventies who failed to do the same whilst leaning into the trunk. My car would still be without those panels unless bluecoupe had not driven an hour or so to help this old geezer out. For which I am eternally grateful.