My vehicle is a 1988 240 wagon, automatic. I need to replace the plastic trim around the shift lever - the one that shows P N D L R. In order to R&R it intact, the black knob with the overdrive button on the side and the release button on top must be removed. There is no set screw visible, so how is the knob attached, and what does it take to remove it? [In my '87 5 speed, the knob is glued on]. Any advice by those with experience will be appreciated!