I am trying to remove the plastic knob on the seat back release lever. A
picture of it is here: http://tinypic.com/k0q1dl.jpg

I need to get this little thing off so I can slide the seat cover up and off
for an upholstery repair:

There is a small hole on the side of this knob but it appears to be just a
hole. I can see bare steel but no allen hex, slot or torx screw. One would
think this hole is for pushing against a tab to release the knob. This
doesn't work. I've tried prying along the inside of the back of knob,
looking for a release tab but seem to have found nothing. I've also tried
simple prying but have come to the limit where I figure any more and it will
be broken.

If you have any knowledge of how to remove this knob without breaking it,
please let me know.