I recently made a mistake by using stainless sheet metal screws to hold my liner together. I pulled it all out and replaced them with stainless rivets. I was really surprised at how much the screws lost the battle to the liner. Really glad I removed the whole thing to replace them. Were these screws made of inferior stainless? My liner has gone through a whole year of heating/cooling already, not being familiar with metal if stainless tempers, perhaps the year of heating/cooling has my liner stronger and why the screws were simply outmatched. Thanks!