I've used small needle nose pliers like a pickle fork ball joint removal
too to remove stuck knobs. The trick is to have something
to cover your fulcrum point on the cover to prevent damage. If you
have a popsicle stick and a fork you don't care too much about, with
the power off, of course, slide the fork under the flat knob and use
the wooden stick under the fork to protect the plastic cover and pry
against the popsicle stick to pop the knob off. It should work without
scarring op the plastic. ^_^
OK, it's done. I used a couple of spoons - thanks to whoever suggested
them - to pry with. They worked well because they were thin enough to get
under the lip at top and bottom, rounded to provide a fulcrum; two because
one can either pry with even or differential pressure at two points.
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