we have 2011 rushmore and had the same problem. Even when new, cooking with multiple pots or one big pan of water would squash the grommets and often would fall through as well as get torn if replacing grate after cleaning. I found new ones at local rv shop and then per instructions on thread in the forum somewhere, used tap and die and threaded the grate ends and bought appropriate sized nuts and threaded them on. I also found some galvanized washers with built on rubber washer and loose fitted them over grommets and under the nuts threaded on the four grate "legs". This obviously leaves the grate much higher than original but has not caused a problem. My original grommets only made it about 3 months. Have not tore or lost any since modification and it is almost 9 months now.