I just had to remove the entire ignition assembly on my 123 becuase the tumbler was stuck and in frustration i broke the key off inside of it. If you can't get just the tumbler assembly out it is a pain but not that bad of a job looking back on it. My problem now is that i don't have a replacement tumbler/ignition system and since i don't have a spare car i just took the ignition switch part and wired that back up so i just turn that with a screwdriver.. no tumbler assembly is there at all.

Works perfectly... so now i'm thinkin if i get time maybe i'll make a couple toggle switches and a push button for start up

would be pretty cool

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'87 300D new to me
'85 300D Sold
'83 300cd Sold