Honestly, it's better just to buy the cheapest micro out there. When something breaks you just buy another. $49 or there abouts, went through several of them with my dad's dementia/Alzheimer's when he was in the house. If it wasn't one thing it was another. Glass turntable, the little cardboard vent cover inside, the plastic wheel ring...was a real drag. But when you find a glass tray for 20-30 dollars, and you can't confirm it will fit, and you know they need to eat (mom was in the house too) you just keep buying them, and interchange what parts remain. Was a lot better then hiding the micro and forgetting to turn off the stove breaker then coming in to find he burned a stack of paper plated to the ground. Glad it wasn't the house!