Thanks Neil,
Trust me I know all about the worn ignition barrel saga! My son's(Ps2cho) 300TE did that to us, and we learned the hard way... we had to drill/grind it out!
I just got a new master key, and it worked fine in all the locks... and I did wonder if the key was the issue... so I tried the new master key and it stuck too, and took me longer to get it back out!
I posted a new thread cos it just seemed odd how one min it was fine then it was stuck!

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2009 Mercedes ML320 Bluetec