Need to remove the wiper motor. Haynes manual shows to remove two bolts, and the "stud nut" which attaches to the wiper linkage. There is a stud connecting the linkage, but no hex nut to turn. On the stud there is a black plastic spacer, then what I would call a tapered ferrulethat has groves which make me believe it would unscrew off the stud. I can't budge it, and don't want to break something.
How does that stud come off?

 

On a...............? General year?

 

This is on a 1999, so I am sure the process would be the same for 98-02 and my guess is that it would work on '93 and up.