You can also get one with a removable star, friction fit. You can pull it off and drop it in you pocket or into the glove box, then stick it back in while driving.
Replacement is easy -- open hood, reach up through the access hole with a pair of pliers, pull down on the black metal u-shaped clip and rotate CCW 90 degrees.
Pull old base out, insert new base, then reach up and pull down the clip and rotate 90 degrees clockwise.
Don't play with the new one and rotate the retainer on the new out of the car, it turns fairly easily and will pinch the s... out of you when it snaps down!
1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!