If your lock set up is the same as mine (and make sure it is) then you'll want to see this:

http://www.peachparts.com/shopforum/tech-help/200554-1987-300e-key-stuck-ignition-post1640662.html#post1640662

Hey I just replaced my Tumbeler to my 300e, The old one wouldnt turn so i had to force the wiring to the 300e mercedes ignition switch diagram... To make a long story short, All the wires are loose from freeing the wires from the ignition housing...
Does anyone know or have the wire codes to the ignition switch diagram?