steering column
The plate with notches cut into it is called the locking plate and you need a locking plate puller kit from any auto store. They come with two u brackets and some bolts.
After you install the puller kit you depress the plate and then use a pick to get the small metal ring out of the groove in the upper steering shaft.
It is a long complicated process to tear down a GM tilt column if you haven't done it before.
Here this link should help.
http://www.buickperformance.com/tilt...lumnwobble.htm
Please let me know if you have any questions.
Also if you know where to look you can get help since virtually all GM tilt columns from like 1972 to about the mid 00's are about the same.
Thanks.


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