Dean, as I recall the black barrel came out with the lock cylinder when the release wire disengaged the paws.

Evan, once the old lock cylinder is removed turn and remove the key. Insert the new lock cylinder into the barrel then insert the key and turn the key to the removal position. Reinstall the lock cylinder/barrel unit ... it will snap into place when the paws grab. As Dean mentions it takes some patience to release the ignition cylinder ... once you actually release it you'll have a 'feel' for how simple it is. The key is to make the release tool from 2mm wire with precise bends and angle cuts.

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Fred Hoelzle