How to remove the ignition lock cylinder from the dash. Key missing

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Key broke and lost, so have no key to turn the cylinder. Wish to remove the lock cylinder to have new key made at dealer or locksmith. Do not wish to destroy the lock if possible. I am a mechanic and know that there must be some way to remove the cylinder from the sleeve. Any help is appreciated. Am willing to pay for information. New cylinder is over 100.00 dollars. This is a car being restored. Thanks