Take a look at this thread http://www.peachparts.com/shopforum/showthread.php?t=82226&highlight=diamond. Look for the post 11 in by jbaj007. He did a good writeup on drilling out the assembly. One of these days I am going to do it on my parts car and take plenty of pictures so I can add it to my page about ignition assembly troubleshooting. http://garnet.acns.fsu.edu/~jjs5772/W123/

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'84 300CD Turbo 132k (Anthracite Grey) - WVO - My daily driver - Recently named coo-coo-coupe by my daughter.
'84 300D Turbo 240k (Anthracite Grey) - Garage Queen
'83 300D Turbo 220k (Orient Red) - WVO - Wifes daily driver

I'm not a certified mechanic, but I did stay at a HolidayInn Express last night.