i HAD THE SAME PROBLEM, JUST TURN THE COVER AS FAR AS IT WILL GO IN THE DIRECTION OF THE ARROW TILL IT STOPS THEN GENTLY LEVER IT OFF,USE A SPOON HANDLE OR SOMETHING SIMILAR, IT SHOULD THEN LIFT OFF. TRY A SPRAY OF WD40  OR SOME OTHER LUBRICANT THIS SHOULD HELP.
                 DORIEL
                
 May 2006