My ignition is failing to turn occasionally so it seems like it is time for a new tumbler. I did this procedure in my now sold '79 240D (the whole bit with the paperclip) but in my current early '79 240D the tumbler assembly is different; The "face" of the tumbler is smaller and most importantly there is no hole to poke with a paperclip to release the bezel. How do I get the tumbler out?

__________________
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