sorry if this has been covered . . . i did a hasty search and couldn't find any threads covering my problem. so, i rely on the kind support of my fellow benzers. i ordered a new key from the dealer (local key shops wanted double or more to duplicate my current key). it works okay in both doors, the glovebox and the trunk, but not at all in the ignition. i noticed the old key has sort of rounded edges from years of use. should i take my dremel tool and grind the corners off a little so it looks more like the old key?

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1979 300sBd (that's Bio, baby!) - 170,000 miles