I am replacing the auger on my 10 year old Accentra Insert. When I removed the old one, there was what appears to be a rubber gasket between the Bearings Flange and the receiving spot on the stove. I can't find any mention of this part in my manual or on this forum. When I removed it, a quarter of the rubbery circle was already gone. It came of in pieces. I assume I need to replace this as well. Does anyone know what I'm talking about? Sorry if it's vague.