ps2cho, the wire tool releases both the tumbler and the black shroud. As far as I know the black shroud is a hardened metal intended to prevent tampering with the tumbler. Spend some more time attempting to insert and turning the key to Position 1 so you can use the wire tool. Did you purchase the new tumbler from a MB dealer? It doesn't lool like the tumbler that the MB dealers sell, at least not the two I have purchased.

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Fred Hoelzle