Did you find my post about this subject ,an 83 300cd ? I had to drill the locking pin on the column out which then released the ignition assembly ,this becomes a paperweight at this point ,a new ignition assembly and new tumbler which comes with keys and I was back in business .It takes 30 minutes fighting the the pin during drilling ,a good set of drill bits are needed .Another detail was that as I inspected my new tumbler it was not aligned from the manufacturer to line up with the locking collar so the spin on locking collar is another fancy paper weight.