A good locksmith will have a tool to grab onto the sides and "break" the tumbler out. It will cost around 75-100 dollars. Alot better than screwing around with the dealer. Of course you will have to replace more than just the tumbler.

Ask an independant repair shop. I am sure that they have had to do this before and know which locksmiths have it.

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R. Downs
1985 500SEL (260,000 miles) SOLD!
1974 280 SOLD!
1994 Volvo 850 Turbo Wagon (Yuppie Ice Sled)

"I know I have a Benz and they know it too." If you start bragging about it or shoving in people's face, you then become a Wally; especially to the girls.