You mean the outside pusher guards -- the serrated metal pieces? Yes they just screw off. Be careful about using a tool though. They are not thick, and you will put them out of round if you are not careful. I would just try a little rubber for grip first.
As an additional note, if you case is that grungy that these parts are so hard to loosen, the whole thing probably needs a service. Just take it to a watchmaker - the case will come back all nice and ultrasonically cleaned - but be careful to tell him not to polish it.
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