The ring assembly is a weak link in the GE Adventium. They break - the question is when and how often? There are 3) thin, white plastic wheels that break. Appliance PartsPros.com keeps plenty in stock, and delivered the very next day by FedEx ground!!! Simply lift the clear glass tray, pick up the old Ring Assembly & replace it with the new one. Replace the old glass tray and you are back in business!!