I did a photo page on rebuilding ignition cylinders, which may help. This was for my 190, but all older Mercedes ignition cylinders are similar:

Lock190

I have found that steel taper pins for clocks work best for reassembly. Cut to size before you insert them, and then tap them home. You can buy them here:

Horolovar Steel Taper Pins .075" - .045" - The Horolovar Company

Door locks are even easier, I am still working on a web page for those.

After years of pulling ignition cylinders with homemade tools, I finally treated myself to a factory made puller on EBay. Its a pleasure to work with good tools.