Bob, definitely buy the new igntion cylinder at your local MB dealer. Take your registration card to the Parts Department, or call them and fax the registration card, to prove you own the car. Also, you'll probably have to pre-pay. There are numerous threads regarding how to remove the ignition cylinder with a u-shaped wire bent to specific dimensions ... with the ends filed at an angle to release the cylinder. As mentioned, if the key will turn to Position 1 leave it there and immediately order a replacement cylinder ... takes a day or two from the dealer ... comes with one new key identical to the others for your car (assuming all existing locks are original).

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Fred Hoelzle