Alternatively you can slowly and carefully loosen the grille that sits firmly in the groove with your fingers by gripping the edges and pulling bit by bit. Works fine for me but it will require some effort since the grille is firmly snugged all along the groove when the speakers are brand new out of the box.
I've tried the method you suggested and gave up without being able to budge the grilles. Figured I'd just put a thumb through a driver if I went any further! I just taught myself to appreciate the looks with the grilles in place
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