I have an old f-10 with the cast iron burner tops. they continually corrode here in the caribbean
and frequently (6 month interval...or so) block off completely. i simply take them topside and bang them with a hammer and put'em back. that works for about three years. then i get to buy new ones. Unfortunately, when force 10 went to the stainless burners, they did not make them compatible with the original type. (also do not ever let oven
cleaner get on your ceramic broiler - end of story for mine.