If you are using a U-shaped tool with the ends sharpened to remove the ignition tumbler the key needs to be turned to Position 1. Check your Owner's Manual for the key alignment in Position 1. If you have never done this before it takes patience until you get the "feel" for releasing the tumbler. As with most things, once you do it the first time it will be far easier next time around.

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Fred Hoelzle