I never got around to doing it. When my ignition was giving me problems I ordered a new tumbler and a new key to replace the brass one that came with the car, but the old ignition worked fine with the new key. I still do not regret ordering the tumbler though because the dealer told me they do not have many of this old style left. I believe mine had to be ordered from Germany.

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1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver

1982 300SD - 232K miles - Wife's Daily Driver

1986 560SL - Wife's red speed machine