Doing the screwdriver method now. You are so right, it doesn't feel too reliable that way! Also just got the replacement ignition switch, created a new thread on it here.

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1982 300D, anthracite grey, 260k miles, Greasecar
1999 E300D, black, 160k miles, Greasecar
2010 Honda Insight Hybrid
http://www.chuckwyatt.com
http://www.wordimpressive.com

Sean is right, don't try to use some POS from your local auto parts dealer, with a key that doesn't match your other locks.. Also, with the new tumbler from MB, you get a new key and it all matches your other locks. If you are a MBCA member, most dealers will give you a 20% discount.

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Houston, Texas
1984 300CD 235K miles, Elvira, one owner
1987 300TD 180K miles
1974 TR6 78K miles Sarah Jane, one owner
OBK #27

If you grind down a square shaft screw driver to fit the key slot in the ignition switch, you will not round it out. Have you tried washing the tumbler with hot soap and water? It really does work. Has anyone else tried it?

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85 300D turbo pristine w 157k when purchased 161K now
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked

1.(As you've already been told) The Factory "Tumbler"(Even thought it's not a
Tumbler but a "Leaves" container) with new key To Your VIN is the simplest.
2.The ONLY Lubricant to insert in MERCEDES Locksets is:
part # 001 989 26 51 10

(Personally I'd "Steer Clear" of ANY Critical Function Apparatus replacemant of
part with URO brand.)

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'84 300SD sold
124.128