Buick Repair Questions? Ask a Mechanic for Answers ASAP
that's an ignition cylinder, I would recommend replacing it before it gets stuck because then it can become verydifficult to remove, if you buy a GM one it will come uncoded but they are simple to assemble and will come with instructions, that way you retain the same key as your doors. I will pull up the procedure for you here shortly
Caution: Refer to SIR Caution in Cautions and Notices.
Push down on the allen wrench in order to release the tab on the lock cylinder inside the lock cylinder housing.
Important: The gears between the ignition switch and the lock cylinder housing must be in the correct position. Failure to do so will cause a misalignment of the gears in the ignition switch and the lock cylinder housing, which may result in a NO START or BATTERY DRAIN.
Basically look under the steering column it will either have two bolts going up or none, if they are present remove them, the plastic cover then pops into two peices, use a plastic tool and gently work around till it all releases, then disconnect the battery and turn the ignition forward then push the release and pull outward.