Hi all,
I am struggling to replace the ignition tumbler and switch in my '85 300d. I have read the FSM as well as several posts, and watched some videos but I am still having problems removing the locking collar.

My plan is to remove the lock, switch and tumbler to replace the switch and have the tumbler rebuilt by a locksmith as pre-emptive maintenance. Since the key still works, I want to avoid grinding the locking pin so I might be able to reuse the lock.

I have turned the key one notch counterclockwise, and inserted a paper clip (both with and without the tip filed to an angle). I can insert the clip about half an inch into the hole on the edge of the tumbler easily, then another quarter of an inch with slight resistance, however at no point does the locking clip retract allowing me to twist the bezel off. The bezel will wiggle slightly in relationship to the tumbler, so I dont think it is seized in place. I just cant get it to unlatch.

Does anyone see any flaws with my technique, or have any suggestions? If anyone would be willing to take a close up image of the latching mechanism on a spare tumbler, it would really help me get an idea of what I am doing wrong.
Thanks much!