Are you sure they are cotter pins? Sometimes they can be mistaken for screws and vice/versa. If they are cotter pins then you need to have a small "punch" tool and a hammer to tap it out. Be careful though because if its a different kind of pressure pin there can be tiny sleeves that put the pressure onto the band to hold it in place! Might want to take it to a reputable watch repair shop to save you the time and possible frustration of attempting an adjustment yourself!
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