Update: The obnoxious creature is out. I ran into this on another website, and wasn't quite sure I dared try it, but it worked. The other poster recommended vise grips--I discovered that a good pair of channel locks (tongue-and-groove joint pliers) will do it, especially a large one. In fact, large is preferable.
For anybody else who wants to do this and has a tap-in pin: Take a good-sized pair of channel locks, I think mine is about 12 inches or so (I tried a small pair first, but the small ones don't have enough "umph"). Grip the pin horizontally--I worked from the front. Watch out for your machine and don't hit the body or decals as you strike the channel locks near the jaws
from underneath with a hammer. Strike upwards carefully but firmly until the pin gives up. (This is another reason bigger is better: it's easier to hit your channel locks and not your machine.)
And now I can order a new pin.
