I recently noticed that the top two connectors (shaped kind of like ball bearings) of one my CBM-170 grilles both broke off and are now stuck inside the two small holes where they attach the grille to the speaker. I was wondering if anyone has had this issue with their speaker grilles before and/or has advice on how I might get these broken off connectors out of their holes and where to find a new grille. Thank-you in advance.