Ugh!

Drilled out the tumbler with a 1/2" bit after chopping up the lock face with a dremel+cutting wheel. This was surprisingly painless.

Didn't escape this one without losing sleep though.

Tried drilling through the tumbler slowly and checking after each bit if the thing would turn over. Without warning, the drill spun spun the tumbler and turned the ignition, starting the car but we later found also snapped something in the ignition assembly.

After the lock turned, we couldn't get the dog to disengage and allow the black ring to spin off in order to remove the shell of the tumbler

To get at the dog, we drilled sideways up into it, when the chuck of the drill accidentally brushed the dash and the texture ripped a big chunk right off. I didnt realize how fragile the dash was, pretty upsetting after doing everything carefully as to not damage the perfect dash.

Getting the dog to drop was a ridiculous nightmare, toughest part of the job. Eventually we put a notch in the black ring with the cutting wheel, and whacked it with a screwdriver to bump it over the dog until it unthreaded.

After we got the ring off, we were able to pry out the end of the tumbler and figure out that we had broken the ignition.

Then we got to drop the steering column and remove the whole ignition assembly anyhow.

So, thanks to that little pin my car is a total mess, the dash looks like junk, and my ignition is shot anyhow.

Good news is that the ignition is pretty simple. The two halves unscrew from the back, behind the plug. A rod runs through the whole thing, from the ignition lock that makes contact with the tumbler, through a green plastic disc that actuates the shut off valve, and to the switch in the back. This rod snapped at the green disc. I'm repairing it by disabling the column lock, removing the ignition lock, and putting a new rod from the switch, right though the disc and out the front of the ignition to which I can attach a knob.

Hopefully this works and I'm able to patch the dash and cover up this hack job.

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1984 300CD