There are two tumbler retention designs. The first design uses a locking button on the inner end of the tumbler that needs to be depressed to release the tumbler from the column. The second design retains the tumbler with a Torx head screw that engages a tunnel below the tumbler.
if you dont have that style then you might need to break a part off like THIS
The early first design columns were cast without an access hole to reach the tumbler release button. With such columns it is necessary to punch a slotted hole through the casting using a small, cabinet style, standard blade screwdriver. The casting has a subtle rectangular "window" that identifies the location to be punched out. The casting is thin under the 'window' making the modification easy with a few light taps. The correct image to reference for the first design is further along in the same thread,
Lock cylinder removal, linked by Irish_Alley. In the later first design, the 'window' was open from the factory. The second design that retains the tumbler using a screw is the easiest to service. All designs require removal of the turn signal switch and key warning buzzer switch located directly below the tumbler in the square hole linked by Irish_Alley. The key warning switch pulls straight out using a pair of needle nose pliers.
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